________ it be Li Ping who broke the glass?A Cou
问题描述：
________ it be Li Ping who broke the glass?A Cou
________ it be Li Ping who broke the glass?
A Could ; may B Can; can
C May; must D Can; must
这道题答案为什么选D,而不选C,请分析一下,
答
can用于疑问句,指“某事是否是事实",may表推测是一般不用于疑问句