应亨《赠四王冠诗》
参考答案：
这首诗是四个王姓妻弟行加冠礼时的贺词。
— Where is Tom?
— He hasn't come to school today. I think he ______ be ill. [ ]
A. has to
B. should
C. may
D. need
请问空袭前市民应该做好哪些防护行动？
