单项选择:Mary _____ draw and sing.

问题描述:

单项选择:Mary _____ draw and sing.
A.can't B.can C.is
答案选的是B.为什么不能选A?

如果是否定的can't,后面的and要改成or,所以不选择can't
can...and...
can't...or...
固定用法