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

分析 句意:玛丽虽然是个新老师,但她认识班上的每一个学生.

解答 A.either"也"是指两者中任何一个,班上不会只有两个学生,故排除;
B.all"都"是指三者或者三者以上;all+名词复数,而本题中student是单数,故排除;
C.every"每一个",符合题意;D.none"都不"放在句中,表示否定,与本题题意不符,故排除.
故选:C.

点评 本题主要考查不定代词,平时应该熟知这些不定代词的意思和用法,特别是:表示的范围,两者还是三者以上;表示肯定,还是否定的意思等.

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