-----Did Mary come to the party?
---I don’t know．She _____while I was out．
A．may have comeB．must have come
C．might comeD．could come
A

試題分析：這題考查情態(tài)動詞的完成式的用法：從第一句話知道是指過去的事，從-I don’t know，知道是可能已經(jīng)來了。用may have come，A項正確。
點評：情態(tài)動詞的完成式有兩種用法：一種是對過去情況的推測，一種是對過去的虛擬，做題時要結(jié)合上下文來判斷。還要注意情態(tài)動詞的語氣。
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