单项选择题

Only by working hard, ______.

A. you can succeed
B. can you succeed
C. do you succeed
D. do succeed you
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Never before ______ so many people in our country been interested in sports.
A. has
B. have
C. had
D. are
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
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