题目内容

I tried to _________them down to their promise, but I failed.

A. ask
B. tell
C. nail
D. knock

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Nobody but Jack and Tom ________ in the office yesterday.

A. are
B. was
C. were
D. have been

They nodded ________each other in greeting.

A. to
B. for
C. in
D. up

Li Lei didn't meet the famous American professor ________ he was on holiday in American last year.

A. unless
B. until
C. if
D. whether

They were obliged ________their house in order to pay the debt.

A. to sell
B. selling
C. sold
D. in selling

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