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 當(dāng)她到家時，發(fā)現(xiàn)一個穿著黑色衣服的人在開她家的門．

解答 答案：C 句中saw后接復(fù)合賓語，即saw sb doing sth/done；dress與man之間構(gòu)成動賓關(guān)系，要用表示被動的過去分詞；unlock與man之間構(gòu)成主謂關(guān)系，要用表示主動的現(xiàn)在分詞，表示看到某人正在做某事．故選C．

點評 過去分詞是非謂語動詞的一種，用法很靈活，分為簡單式done（表示與謂語同時或幾乎同時發(fā)生的動作）；完成式having been done（表示先于謂語的動作）．學(xué)習(xí)時，要把握其用法特征：表示被動和完成．同時還要注意區(qū)分現(xiàn)在分詞和不定式．

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