单项选择题

Never before ______ so many people in our country been interested in sports.

A. has
B. have
C. had
D. are
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单项选择题
______ when I heard someone knock at the door.
A. Hardly had I sat down
B. Hardly I had sat down
C. I hardly have sat down
D.I was hardly sitting down
单项选择题
I have made it clear ______ I will never turn to him.
A. when
B. that
C. where
D. however
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