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________ you happen to see Mary, would you please ask her to come here?
A.WouldB.CouldC.ShouldD.Might
C

試題分析:考查虛擬語氣的倒裝。本題是一個與將來的事實相反的虛擬語氣,從句中可以有三種情況:過去式;were to do sth; should+動詞原形;如果條件句中省略了if,要使用部分倒裝的形式的形式。本題正是省略了if;句意:如果你碰巧遇見Mary,請告訴她來這里。故C正確。
點評:條件句中的虛擬語氣要注意,如果過去事實相反,條件句中使用過去完成時,主句使用“情態(tài)動詞+have done”;如果主句與現在事實相反,條件句中使用過去時,be動詞使用were,主句中使用“情態(tài)動詞+動詞原形”;如果與將來事實相反,條件句中有三種:過去時;were to do ;should+動詞原形,主句使用“情態(tài)動詞+動詞原形”;要特別注意如果省略了if,句子要使用部分倒裝的形式,把助動詞,be動詞,情態(tài)動詞提之主語前。
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