【題目】Much time _____ siting at a desk, office clerks are generally troubled by various health problems.

A. being spent B. having spent

C. spending D. spent

【答案】D

【解析】

試題分析：考查獨立主格結(jié)構(gòu)。當(dāng)分詞做狀語的時候，如果構(gòu)成分詞的動詞與句子的主語構(gòu)成主動關(guān)系，就使用現(xiàn)在分詞做狀語；當(dāng)二者構(gòu)成被動關(guān)系，使用過去分詞做狀語。如果分詞的動作發(fā)生在謂語動詞之前，就使用分詞的完成式。如果分詞與句子的主語沒有關(guān)系，可以使用狀語從句或者獨立主格結(jié)構(gòu)。本句中名詞短語much time與主句主語office clerks沒有關(guān)系，使用在much time的后面添上過去分詞spent構(gòu)成獨立主格結(jié)構(gòu)。因為much time和spend構(gòu)成被動關(guān)系，所以排除BC兩項。因為BC兩項表示主動，A項表示正在進行，本句表示的是已經(jīng)完成的動作。所以使用過去分詞表示被動和已經(jīng)完成。故D正確。

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