单项选择题

In some cases, different approaches to the same scientific problem lead （） conflicting theories.

A. at
B. to
C. of
D. for

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单项选择题

I hesitated for a long time, and in the end I decided to （） the job.

A. take
B. apply
C. find
D. search

单项选择题

Is this the（）that you are late again

A. season
B. cause
C. reason
D. excuse

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