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19．David，_____ I have been sharing a dorm for more than two years，is quite a funny guy．（　�。�
A．of whomB．with whomC．in whomD．from whom

分析 戴維是個非常有趣的家伙，我已經和他在一間屋里住了兩年多了．

解答 答案：B．根據句式可以知道，_____ I have been sharing a dorm for more than two years是定語從句，先行詞是David，又因為和某人共享某物用share sth with sb，因此答案是B，其他選項的介詞不對．

點評 考查非限制性定語從句．
非限制性定語從句中的介詞主要根據先行詞和和定語從句的謂語決定，如本句with就是由從句的謂語share sth with sb決定的．

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