【題目】Water pipes ______ rusty after a period of use. ( )

A.becomeB.is becomingC.are becomeD.were become

【答案】A

【解析】

句意:水管使用一段時(shí)間后生銹了。句意可以看出此句用一般現(xiàn)在時(shí),pipes復(fù)數(shù),故選A。

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