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單項(xiàng)選擇題

It takes about 12 seconds to reverse（）full speed ahead（）speed astern.

A.at, to
B.to, from
C.from, to
D.at ,from

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It was essential that the application forms（）back before the deadline.

A.must be sent
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D.were sent

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Jim is sorry（）so impolite to your guest last Saturday.

A.to be
B.being
C.having been
D.to have been

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