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單項(xiàng)選擇題

It was convenient（）close to work.

A.to living
B.living
C.live
D.lived

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The problem is（）by pollution.

A.caused
B.because
C.due
D.because of

單項(xiàng)選擇題

The mistake was（）by carelessness of the assistant.

A.due
B.caused
C.because
D.owe