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單項選擇題

Could you show me （）to operate the derrick?

A.which
B.what
C.how
D.when

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單項選擇題

Be careful when you （）the derrick.

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

單項選擇題

Is that all right at this（）?

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