问题
选择题
--- It is strange that he ______ come so late.
--- Something unexpected must have happened to him.
A．should
B．could
C．must
D．might
答案
答案：A
情态动词辨析。A. 应该 ；不该 B. 能够 C. 必须 D. 可能。句意：很奇怪，他不该来的这么晚。——他肯定发生了什么不可预料的事情。故选A。