More amd more people have realised we won't have cleaner wat
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More amd more people have realised we won't have cleaner water to drink unless something _____ soon
A.was done B.will be done C.to be done D.is done
请详细讲讲,另外,be done在这里是什么意思
A.was done B.will be done C.to be done D.is done
请详细讲讲,另外,be done在这里是什么意思
答案是D
unless引导条件状语从句
相当于if not
if something is not done soon如果不及时采取措施
A过去时不对,B不用将来时,因为这是条件状语从句
C不能充当从句谓语
be done是“被做”的意思,表示被动的.
unless引导条件状语从句
相当于if not
if something is not done soon如果不及时采取措施
A过去时不对,B不用将来时,因为这是条件状语从句
C不能充当从句谓语
be done是“被做”的意思,表示被动的.
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