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20．Some people wear masks only in crowds，_____ they expect to come into contact with lots of germs．（　　）
A．whichB．whenC．whereD．as

分析 一些人只會在他們認為容易接觸病菌的人群中戴口罩．

解答 答案：C
題干中they expect to come into contact with lots of germs修飾前面的名詞crowds，是一個非限制性定語從句；從句結構完整，要用關系副詞；when表示時間，where表示地點．句意表達的是抽象地點，故選C．

點評 定語從句是用來修飾名詞的形容詞性從句，相當于一個形容詞．連接定語從句的引導詞分為關系代詞和關系副詞，關系代詞在從句中要作主語或賓語；關系副詞在從句中作狀語．這也是選擇關系詞的一個判斷方法．

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