单项选择题

Unfortunately, when I dropped in, Professor Smith ______, so we only had time for a few words.

A. has just left
B. had just left
C. just left
D. was just leaving

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单项选择题

-- Did Alan enjoy seeing his old friends yesterday -- Yes, he did. He ______ his old friends for a long time.

A. didn’t see
B. wouldn’t see
C. hasn’t seen
D. hadn’t seen

单项选择题

I’d rather that you ______ the operation right away.

A. perform
B. should perform
C. will perform
D. performed

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