单项选择题
()we swing the port derrick inboard?
A.Shall
B.Are
C.Is
D.Be
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单项选择题
()is the rate of discharging here?
A.When
B.Why
C.What
D.Either A or B
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单项选择题
The ()of the derrick is out of order.
A.black
B.back
C.block
D.broken
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