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單項(xiàng)選擇題

Be careful when you （）the derrick.

A.operated
B.operate
C.operating
D.operator

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單項(xiàng)選擇題

Is that all right at this（）?

A.high
B.heigh
C.height
D.higher

單項(xiàng)選擇題

What’s the （）of the derrick?

A.SLW
B.LSW
C.SWL
D.FWE

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