问题
选择题
— Hi, Mary. Any idea where Bill is?
— He ______ in the library. I saw him reading books there just now.
A．shall be
B．should have been
C．must be
D．might have been
答案
答案：C
虚拟语气辨析。句意：嗨，玛丽，知道比尔在哪儿吗？——他一定在图书馆。我刚才看到她在那儿读书了。可知下文是对事实的肯定判断，不用虚拟语气，故选C。