单项选择题

It would seem to be a general truth（）nothing is as straightforward as it at first seems.

A. that
B. when
C. because
D. if

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单项选择题
A storm buried Illinois under several inches of snow Tuesday,（）at least 100 people dead in traffic accidents.

A. to leave
B. leave
C. left
D. leaving
单项选择题
As it turned out to be a problem of no importance, we（）so much time looking into it.

A. needn't spend
B. didn't have to spend
C. oughtn't to spend
D. needn't have spent
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