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【題目】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】考查動詞時態(tài)。句意:水變得又臟又黑,已經不能繼續(xù)安全飲用了。根據It's no longer safe to drink.可知,給現在帶來的結果是不能飲用了,所以用現在完成時,表示過去的動作對現在的影響,故選B。

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