单项选择题

______ five minutes earlier, you would not have missed the last train for Shanghai, but you were late.

A．Had you come
B．Do you come
C．Did you come
D．Should you come
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单项选择题
______ the former president's supporters went out in the streets to express their anger and dissatisfaction.
A．A small amount of
B．A large number of
C．A little bit of
D．A great deal of
单项选择题
After he worked out the solution, ______ appeared a smile on his face.
A．it
B．here
C．what
D．there
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