單項選擇題

（）we swing the port derrick inboard?

A.Shall
B.Are
C.Is
D.Be

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單項選擇題

（）is the rate of discharging here?

A.When
B.Why
C.What
D.Either A or B

單項選擇題

The （）of the derrick is out of order.

A.black
B.back
C.block
D.broken

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