單項選擇題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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1.單項選擇題It was essential that the application forms（）back before the deadline.
A.must be sent
B.be sent
C.would be sent
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2.單項選擇題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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