问题
单项选择题
It takes about 12 seconds to reverse（）full speed ahead（）speed astern.
A.at, to
B.to, from
C.from, to
D.at ,from
答案
参考答案：C
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It takes about 12 seconds to reverse（）full speed ahead（）speed astern.
A.at, to
B.to, from
C.from, to
D.at ,from
参考答案：C