Share C1 Advanced Present Perfect and Past Forms
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She realized that her research team _____ on the incorrect dataset for days before the statistical error was discovered.
had been working
has worked
works
was worked
The structural engineering firm _____ the durability of high-density materials since the construction project began last spring.
was testing
has been testing
had tested
tested
The archaeologists discovered that the ancient manuscript _____ in a sealed airtight chamber for centuries.
had been preserving
has been preserved
was preserving
had been preserved
The lead investigator realized mid-interview that the suspect _____ about his whereabouts all along.
was lied
had been lying
has lied
lies
She abruptly turned off the computer because a suspicious network error message _____ twice already.
had appeared
appears
was appearing
has been appearing
Our research division _____ five comprehensive reports on climate resilience since funding commenced in 2022.
had been publishing
has published
was published
published
The author finally submitted her manuscript yesterday after she _____ the final chapter three times.
had painstakingly rewritten
was painstakingly rewriting
painstakingly rewrites
has painstakingly rewritten
He _____ any official notification from the admissions department regarding his application status yet.
did not receive
had not been receiving
has not received
was not received
The legal firm took on the complex case only after senior partners _____ all potential conflict risks.
had evaluated
were evaluating
evaluate
have evaluated
They _____ for a suitable investment property for almost a year before finding this off-market commercial lot.
search
were searched
have searched
had been searching
The regional director _____ the execution of over twenty infrastructure projects since taking office last January.
was overseen
had been overseeing
oversaw
has overseen
The defense attorney argued that his client _____ in his office when the incident took place.
works
had been working
was worked
has worked
The scientific panel published their findings only after peer reviewers _____ the absolute validity of the empirical data.
were confirming
have confirmed
confirm
had confirmed
She _____ the draft contract when her colleague called to inform her of the sudden policy alteration.
carefully reviews
was carefully reviewing
has carefully reviewed
had been carefully reviewed
The flight crew _____ the severe weather system long before air traffic control issued the compulsory rerouting order.
monitor
have monitored
were monitored
had been monitoring
He realized he lost his security clearance badge only after he _____ through his entire briefcase twice.
has been searching
searches
was searching
had searched
