The doctor says that the problem with her husband 's eyes---

问题描述：

The doctor says that the problem with her husband 's eyes______ by many reasons.
A.cause.B.causes.C.is caused.
D.are caused
1个回答 分类： 英语 2014-11-03

问题解答：

我来补答
C 再答： problem是主语，单数
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