Which of the following sentences conveys a fact?  

A．Maryandhersonmustbehomebynow.
B．Carelessreadingmustgivepoorresults.
C．It’sgettinglate,andImustleavenow.
D．Hemustbeworkinglateattheoffice.

C

解析試題分析：考查虛擬語氣：must可以表示“必須”是指事實，C項的意思是：很晚了，我必須走了。而如果表示推測，這是肯定的推測，不一定是事實，A. Mary and her son must be home by now. 瑪麗和她兒子現(xiàn)在一定在家。B.Careless reading must give poor results. 粗心閱讀一定會有很差的結果。D. He must be working late at the office.他一定在辦公室工作的很晚。選C。
考點：考查虛擬語氣

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