It is said that there are some diseases 空 by chemicals空 in p

问题描述:

It is said that there are some diseases 空 by chemicals空 in people’s bodies over time.
A.causing; building up B.caused; building up C.causing;built up D.caused;build up
1个回答 分类:英语 2014-10-17

问题解答:

我来补答
B,前面是由.造成的,应该是被动,后面build up的逻辑主语是diseases,故是主动关系
 
 
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