题目内容

_______ four years since John left school.

A. They have been
B. It is
C. It was
D. It have been

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By the time I left the school I __________ that course for ten years.

A. taught
B. have taught
C. had taught
D. teaches

She asked the worker how long _______ to build the church.

A. it would take
B. had it taken
C. it takes
D. it had taken

Mary couldn't open the front door because she _______ the key.

A. had forgotten
B. was forgetting
C. has forgotten
D. forgot

They told us that they _________ for more than two hours.

A. had been waiting
B. were waiting
C. have waited
D. has waited