• C1 Advanced Present Perfect and Past Forms
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  • The archaeologists discovered that the ancient manuscript _____ in a sealed airtight chamber for centuries.
    had been preserved
  • The lead investigator realized mid-interview that the suspect _____ about his whereabouts all along.
    had been lying
  • She abruptly turned off the computer because a suspicious network error message _____ twice already.
    had appeared
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