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【题目】The water in the river_________ clean and clear. It's safe to drink it.

A.becameB.has becomeC.will becomeD.was becoming

【答案】B

【解析】

句意:河水变得清澈了。喝它是安全的。

本题考查时态。became是一般过去时,has become是现在完成时,will become是一般将来时,was becoming是过去进行时。根据It's safe to drink it.可知,现在河里的水,是安全的,表示现在已经安全了,因此用现在完成时。故选B

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