20．He likes music _______ I prefer sports．（　　）
A．whenB．whileC．howeverD．whenever

分析 他喜歡音樂而我喜歡運動．

解答 答案是B．本題考查并列連詞while．when這時；當(dāng)…時候；however然而；無論如何；whenever無論何時；while用作并列連詞表示兩者間的對比和轉(zhuǎn)折"然而"，根據(jù)題干判斷，句中表達(dá)的是"我"和"他"之間的對比和轉(zhuǎn)折，故選B．

點評 首先要理解連詞的功能：并列連詞連接并列的詞、短語或句子；從屬連詞連接主從句；其次理解各連詞含義；最后結(jié)合語境做出判斷．

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