问题描述：
-what do you think the noise was?
-It _____a cat.
A may be B might be
C could have been D might have been
可为什么答案写的是D呢？
-It _____a cat.
A may be B might be
C could have been D might have been
可为什么答案写的是D呢？
问题解答：
我来补答展开全文阅读