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【题目】The water dark and dirty. It's no longer safe to drink.

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

【答案】B

【解析】

句意:水已经变得又黑又脏,再也不能安全饮用了。

本题考查时态,根据题意可知,这里表示水已经不能再喝了,所以是过去发生的事情对现在产生了影响,应该用现在完成时,所以本题选B

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