－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)動詞表示推測�！扒閼B(tài)動詞+動詞原形”表示對現(xiàn)在情況的推測；“情態(tài)動詞+have done”表示對過去情況的推測。根據(jù)第一句中的didn’t說明本句是對過去情況的推測。排除AD。Might have done本可以做某事，實際上卻未坐，這是一個虛擬語氣，并非是對過去情況的推測。Must have done sth一定做了某事。句意：—為什么Susn昨天沒有像她答應(yīng)的那樣來看我？—她一定是太忙了。故C正確。
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