单项选择题

There is no doubt（）Herbert is the most industrious student in our class.

A. whether
B. what
C. that
D. if

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单项选择题

（）the result, I would not have asked you to tell me.

A. If I know
B. Had I known
C. I had known
D. If I knew

单项选择题

A couple of minutes earlier,（）we could hve been able to hear his speech.

A. and
B. on
C. but
D. so

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