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

    A. became B. will become C. has become D. was becoming

    【答案】B

    【解析】试题分析：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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