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(rèn)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(gè)非限制性定語從句；從句結(jié)構(gòu)完整，要用關(guān)系副詞；when表示時(shí)間，where表示地點(diǎn)．句意表達(dá)的是抽象地點(diǎn)，故選C．

點(diǎn)評 定語從句是用來修飾名詞的形容詞性從句，相當(dāng)于一個(gè)形容詞．連接定語從句的引導(dǎo)詞分為關(guān)系代詞和關(guān)系副詞，關(guān)系代詞在從句中要作主語或賓語；關(guān)系副詞在從句中作狀語．這也是選擇關(guān)系詞的一個(gè)判斷方法．

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