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
D.were sent

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

3.單項選擇題John regretted()ashore yesterday.

A.not going
B.not having been going
C.not to go
D.not to be going

4.單項選擇題Lifting the anchor from the bottom is called().

A.broaching the anchor
B.shifting the anchor
C.walking the anchor
D.weighing the anchor

5.單項選擇題Lines drawn through points on the earth having the same atmospheric pressure are known as().

A.isothermal
B.millibars
C.isobars
D.seismics