问题
选择题
—Why didn’t Susan come to school?
—I don’t know. She____ ill.
A．could be
B．may have been
C．might
D．must have been
答案
答案：B
本题回答语表示的含义是苏珊可能生病了，所以导致的后果是她未能上学，故用情态动词may+完成时态的结构，故本题选B。
搜题请搜索小程序“爱下问搜题”