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【题目】The water dark and dirty. It's no longer safe to drink.
A.became
B.has become
C.will become
D.was becoming

【答案】B
【解析】考查动词时态。句意:水变得又脏又黑,已经不能继续安全饮用了。根据It's no longer safe to drink.可知,给现在带来的结果是不能饮用了,所以用现在完成时,表示过去的动作对现在的影响,故选B。

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