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單項(xiàng)選擇題

（）using the derrick at once，the gooseneck is bent.

A.Continue
B.Start
C.Commence
D.Stop

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（）this the Chief Officer agreed not to put any remarks.

A.At
B.By
C.For
D.Upon

單項(xiàng)選擇題

（）there danger of explosion?

A.Is
B.Has
C.If
D.Do