9．-What has made him so knowledgeable？
-______ domestic and foreign classics．（　�。�
A．Having exposed toB．Being exposed to
C．Exposing toD．Exposed to

分析 -什么讓他如此博學(xué)？
-長期接觸國內(nèi)外的經(jīng)典．

解答 答案：B
題干中是回答作主語的特殊疑問詞what，要用動名詞形式；be exposed to暴露在…之下，（長期）接觸，短語搭配．根據(jù)句意，故選B．

點評 動名詞相當于名詞，具備名詞的特征．在句中可以作主語，賓語，表語，定語等．動名詞和現(xiàn)在分詞的構(gòu)成方式一樣，但用法不同．現(xiàn)在分詞具備動詞的特征，有時態(tài)和語態(tài)的變化，學(xué)習(xí)時要注意區(qū)分和掌握．

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