单项选择题

We had better hurry（）it is getting dark.

A. and
B. but
C. as
D. unless

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单项选择题
No one can be sure（）in a million years.

A. what man will look like
B. what will man look like
C. shat look will man like
D. man wilt look like what
单项选择题
（）he was seriously ill, I wouldn’t have told him the truth.

A. If I knew
B. If I know
C. Had I know
D. Did I know
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