Continious tenses
Help
Henry went online at 8 am. When he logged off at 8 pm, he _____________ (surf) the Internet for 12 hours.
had been surfing
She's busy with an idea for a great app. She ______________ (develop) it for 3 months.
has been developing
I saw two men with a big package outside your house yesterday. ______ they __________ (deliver) your widescreen TV?
Were they delivering
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