Something must -----(do) to prevent flood from ------.(happe

问题描述:

Something must _____(do) to prevent flood from ______.(happen)怎么填空?
1个回答 分类:英语 2014-12-01

问题解答:

我来补答
e done happening
前面something和do之间是被动关系 所以要用be done
后面是prevent sth from doing
 
 
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