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  • -----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(dòng)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(xiàng)正確。
    點(diǎn)評(píng)：情態(tài)動(dòng)詞的完成式有兩種用法：一種是對(duì)過去情況的推測(cè)，一種是對(duì)過去的虛擬，做題時(shí)要結(jié)合上下文來判斷。還要注意情態(tài)動(dòng)詞的語氣。
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