20．Although Mary is a new teacher，she knows ______ student in her class．（　　）
A．eitherB．allC．everyD．none

分析 句意：瑪麗雖然是個(gè)新老師，但她認(rèn)識(shí)班上的每一個(gè)學(xué)生．

解答 A．either"也"是指兩者中任何一個(gè)，班上不會(huì)只有兩個(gè)學(xué)生，故排除；
B．a(chǎn)ll"都"是指三者或者三者以上；all+名詞復(fù)數(shù)，而本題中student是單數(shù)，故排除；
C．every"每一個(gè)"，符合題意；D．none"都不"放在句中，表示否定，與本題題意不符，故排除．
故選：C．

點(diǎn)評(píng) 本題主要考查不定代詞，平時(shí)應(yīng)該熟知這些不定代詞的意思和用法，特別是：表示的范圍，兩者還是三者以上；表示肯定，還是否定的意思等．

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