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cannot与couldnot的用法?Theteachersaidtousthatoneapersonbyhisappearance.a.cannotjudgeb.couldnotjudgec.isn'ttojudged.doesn'tjudge答案是?为什么?

题目详情
can not 与could not的用法?
The teacher said to us that one ____a person by his appearance.
a.can not judge b.could not judge c.isn't to judge d.doesn't judge
答案是?为什么?
▼优质解答
答案和解析
语法上来讲的话COULD是CAN的过去时(但是一般过去时用CAN的特别少).
而语气上来讲,COULD要表现的委婉一些,不确保,但是可以的几率很大,CAN的意思很坚决,很肯定.