It is said that there are some diseases 空 by chemicals空 in people’s bodies over time.

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
英语人气:931 ℃时间:2019-08-21 07:48:15
优质解答
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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