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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When you ______ back to Beijing next month, let me know the exact date.
A. will come
B. had come
C. be coming
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The manufacturer began to speak more______.
A. aloud
B. loud
C. loudly
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