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單項選擇題

（）does it take to change the main engine from ahead to astern?

A.How many times
B.How much water
C.How long
D.How length

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單項選擇題

（）, we continued lifting out the pistons.

A.Late as it was
B.As it was late
C.Since it was late
D.Because of its late

單項選擇題

The exhaust valve is opened at about the same time （） the air inlet ports are opened.

A.before
B.after
C.when
D.until

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