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單項選擇題

The stainless steel bars are painted by（）.

A.lot
B.lots
C.a lot
D.the lots

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The stevedores didn’t listen（）me.

A.to
B.at
C.by
D.for

單項選擇題

The system of derricks and winches has been largely replaced on newer ships by cranes（）it is very efficient.

A.when
B.because
C.unless
D.though

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