单项选择题

The fact remains ()we are behind many others.

A. that
B. why
C. where
D. how

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单项选择题
George did() than anyone else.

A. much work
B. more work
C. work much
D. work more
单项选择题
It () John and Kate who helped me the other day.

A. is
B. was
C. are
D. were
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