I am fond of my sister but she has one serious shortcoming. She be really stubborn.A. can

问题补充：

I am fond of my sister but she has one serious shortcoming. She be really stubborn.

A. can

B. may

C. must

D. shall

答案：

(答案→)A. can

B. may

C. must

D. shall

解析：情态动词用法。Can用语肯定句表示客观的可能性，并不一定会发生。句意：我很喜欢我的妹妹，但是她有一个严重的缺点。她可能会很固执。