【題目】The water in the river_________ clean and clear. It's safe to drink it.

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

【答案】B

【解析】

句意:河水變得清澈了。喝它是安全的。

本題考查時(shí)態(tài)。became是一般過去時(shí),has become是現(xiàn)在完成時(shí),will become是一般將來時(shí),was becoming是過去進(jìn)行時(shí)。根據(jù)It's safe to drink it.可知,現(xiàn)在河里的水,是安全的,表示現(xiàn)在已經(jīng)安全了,因此用現(xiàn)在完成時(shí)。故選B。

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