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

试题分析:考查虚拟语气的倒装。本题是一个与将来的事实相反的虚拟语气,从句中可以有三种情况:过去式;were to do sth; should+动词原形;如果条件句中省略了if,要使用部分倒装的形式的形式。本题正是省略了if;句意:如果你碰巧遇见Mary,请告诉她来这里。故C正确。
点评:条件句中的虚拟语气要注意,如果过去事实相反,条件句中使用过去完成时,主句使用“情态动词+have done”;如果主句与现在事实相反,条件句中使用过去时,be动词使用were,主句中使用“情态动词+动词原形”;如果与将来事实相反,条件句中有三种:过去时;were to do ;should+动词原形,主句使用“情态动词+动词原形”;要特别注意如果省略了if,句子要使用部分倒装的形式,把助动词,be动词,情态动词提之主语前。
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