单项选择题

（）they will have a good harvest this year is still unknown.

A. Whether
B. If
C. Which
D. That

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单项选择题
He asked me ______ I was sure my mother ______.
A. if; will come
B. if; would come
C. that; will come
D. that; would come
单项选择题
We have won many victories, （）more difficulties are still ahead of us.

A. but
B. therefore
C. so
D. for
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