【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(dòng)詞時(shí)態(tài)。句意:水變得又臟又黑,已經(jīng)不能繼續(xù)安全飲用了。根據(jù)It's no longer safe to drink.可知,給現(xiàn)在帶來(lái)的結(jié)果是不能飲用了,所以用現(xiàn)在完成時(shí),表示過(guò)去的動(dòng)作對(duì)現(xiàn)在的影響,故選B。

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