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7.When she got home,she saw a man ______ in black ______ her door.(  )
A.dressing; unlockingB.dressed; unlocked
C.dressed; unlockingD.dressing; unlocked

分析 当她到家时,发现一个穿着黑色衣服的人在开她家的门.

解答 答案:C 句中saw后接复合宾语,即saw sb doing sth/done;dress与man之间构成动宾关系,要用表示被动的过去分词;unlock与man之间构成主谓关系,要用表示主动的现在分词,表示看到某人正在做某事.故选C.

点评 过去分词是非谓语动词的一种,用法很灵活,分为简单式done(表示与谓语同时或几乎同时发生的动作);完成式having been done(表示先于谓语的动作).学习时,要把握其用法特征:表示被动和完成.同时还要注意区分现在分词和不定式.

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