Topics: Perfect Progressive Tenses
How long ______ (they/work) on this project before they finished it?
A. have they been working
B. had they been working
C. will they have been working
Select your answer:

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Idioms › ViewI can’t believe he ___ up the bill and paid for our dinner.
a. set
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In California, you ___ have a driver’s license to drive a car.
A. Has to
B. Must
C. Don’t have to
D. Must not