单项选择题

—My goodness! I've just missed the train.
—That's too bad. I am sure you ______ it, if you had hurried.

A. could have caught
B. had caught
C. would catch
D. could catch
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单项选择题
一Was the doctor there when you arrived —Yes．But he ______ out a moment later．
A．had gone
B．has gone
C．went
D．is going
单项选择题
—where do you think （）he （）the computer —Sorry. I have no ide

a.A. has ; bought
B. / ; bought
C. did ; buy
D. had ; bought
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