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英语选择题1Wise teachers know it's impossible for all the student

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英语选择题1
Wise teachers know it's impossible for all the students to learn all the subjects well because_____of them are not fit for them.
A.every one B.all C.none D.not all
答案给的B,但我不太理解
B
考查部分否定 All .not...或Not all.为部分否定,意为:并非所有的.如:
并非所有的学生都去过北京.
All the students haven't been to Beijing.= Not all the students have been to Beijing.
none of...为全部否定.如:所以的学生都没去过北京
None of the students have/has been to Beijing.
理解请采纳,有问题再问.