单项选择题

The bridge would collapse if all of the people ______ on it.

A. stand
B. stood
C. would stand
D. had stood
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单项选择题
How I wish I ______ a car of my own.
A. will have
B. have
C. had
D. should have
单项选择题
He has been to London, and he ______ there last year.
A. has been
B. has gone
C. went
D. had been
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