英语单选题：More and more people have realized that we will not have cleaner water……
英语单选题：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
英语人气：846 ℃时间：2019-09-29 04:41:56
优质解答
.D unless引导的条件状语从句,主句是将来时,从句中用一般现在时或现在完成时代替一般将来时.
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