－Why didn’t Susan come to see us yesterday as she promised?
－______. 
A．She must be busyB．She might have been free
C．She must have been busyD．She can’t be free
C
考查情態(tài)動(dòng)詞表示推測(cè)�！扒閼B(tài)動(dòng)詞+動(dòng)詞原形”表示對(duì)現(xiàn)在情況的推測(cè)；“情態(tài)動(dòng)詞+have done”表示對(duì)過(guò)去情況的推測(cè)。根據(jù)第一句中的didn’t說(shuō)明本句是對(duì)過(guò)去情況的推測(cè)。排除AD。Might have done本可以做某事，實(shí)際上卻未坐，這是一個(gè)虛擬語(yǔ)氣，并非是對(duì)過(guò)去情況的推測(cè)。Must have done sth一定做了某事。句意：—為什么Susn昨天沒(méi)有像她答應(yīng)的那樣來(lái)看我？—她一定是太忙了。故C正確。
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