单项选择题

But for their help, we ______.

A. shouldn't succeed
B. could not have succeeded
C. will not succeed
D. should not have succeeded
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单项选择题
It's no use ______ any longer. He may come by any bus.
A. waiting
B. to wait
C. having waited
D. to have waited
单项选择题
The USA is composed of 50 states, ______ are separated from the others by land or water.
A. two of these
B. of whom two
C. two of which
D. two of that
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