單項(xiàng)選擇題

The second engineer seemed to know what the sign （）.

A.stand by
B.stand for
C.stood by
D.stood for

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We have just repaired the motorRemember （） to it during your watch.

A.to pay attention
B.paying attention
C.pay attention
D.your paying attention

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Rounds （）Everything is in good order.

A.operated
B.made
C.run
D.done

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