Which of the following sentences expresses a fact?(2013)
A、
Mary and her son must be home by now.
B、
Careless reading must give poor results.
C、
It's getting late, and I must leave now.
D、
He must be working late at the office.
【正确答案】
C
【答案解析】
解析：2013年第64题。A、D项表示推测，即说话人看来一定是；B项表示根据逻辑推理必然要发生某事。C项的must是表示主观必须。
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