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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

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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

單項選擇題

When entering a foam injected space （） breathing apparatus.

A.put out
B.put on
C.take off
D.take in

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