题目内容

She ought to ( ) my letter a week ago. But she was busy with her work.

A. have answered
B. answering
C. answer
D. be answering

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The law required that everyone ( ) his car checked at least once a month.

A. has
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A. carrying out
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D. carry out

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A. in doubt
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A. cooled down
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C. ended up
D. tore off