英語單選題：More and more people have realized that we will not have cleaner water……
英語單選題：More and more people have realized that we will not have cleaner water……
More and more people have realized that we will not have cleaner water to drink unless something ______ soon.
A.was done
B.be done
C to be done
D.is done
More and more people have realized that we will not have cleaner water to drink unless something ______ soon.
A.was done
B.be done
C to be done
D.is done
英語人氣：909 ℃時間：2019-09-29 04:41:56
優(yōu)質(zhì)解答
.D unless引導的條件狀語從句,主句是將來時,從句中用一般現(xiàn)在時或現(xiàn)在完成時代替一般將來時.
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