单项选择题

______ had any extra time, they would have visited the Tower of London.

A. Had they
B. Have they

C. Would they have
D. If they
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单项选择题
I'd rather you ______ me before others knew it.
A. had told
B. have told
C. tell
D. told
单项选择题
______ enough money, we began to carry out our traveling plan.
A. Collecting
B. To collect

C. Having collected
D. Collected
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