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
Tom looks so pale today. He ______ ill.
A. must be
B. had to be
C. should be
D. shall be
单项选择题
______ your help we were successful.
A. According to
B. But for
C. Owing to
D. As for
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