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Both of the students cannot work out the problem means

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Both of the students cannot work out the problem means
A.The two students can not work out this problem
B.Not all the students can work out this problem
C.One student can work out this problem,but the other can’t
D.Neither of the two students can work out this problem
为什么是c
Both of the students cannot work out the problem means
选C没错
both 和all 在句子中如果和否定词连用,表示部分否定,
若要表示全部否定,用 neither 和 none
如:
Both of us are not teachers.我们两个不都是老师.(不都是...注意:谓语用复数are)
Neither of us is teacher.我们两都不是老师 (都不是...注意:谓语用单数is)
All of the books are not new.这些书不都是新的 (不都是...注意:谓语用复数are)
None of the books is new.这些书都不是新的 (都不是..注意:谓语用单数is)
所以题目的句子是说,两个学生不全能解出这个问题.
只有C:一个学生可以解出这个问题,一个不能 这个选项是正确的.