Which of the following sentences conveys a fact?  
A．Maryandhersonmustbehomebynow.
B．Carelessreadingmustgivepoorresults.
C．It’sgettinglate,andImustleavenow.
D．Hemustbeworkinglateattheoffice.
C

試題分析：考查虛擬語(yǔ)氣：must可以表示“必須”是指事實(shí)，C項(xiàng)的意思是：很晚了，我必須走了。而如果表示推測(cè)，這是肯定的推測(cè)，不一定是事實(shí)，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(huì)有很差的結(jié)果。D. He must be working late at the office.他一定在辦公室工作的很晚。選C。
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