單項(xiàng)選擇題

（）will reduce the visibility.

A.dust
B.sea water
C.land sand
D.wind

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（）view of the fact，I wish to submit this report.

A.In
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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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