單項選擇題

（）is the maximum speed of your ship?

A.How
B.Which
C.How about
D.What

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單項選擇題

The fog is too thick. Don’t（）the radar.

A.switch on
B.switch off
C.close
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單項選擇題

（）time will the pilot be available?

A.what
B.When
C.At what
D.At when