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英语语法题There comes a time in every man's life_______A then he

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英语语法题
There comes a time in every man's life_______
A then he has to think B which he needs
C when he has to think D therefore he has to work hard
为什么?
先行词是time,一段时间,所以后面的关系代词要用when
这道题目考察从句的关系代词,可以排除AD两项.
至于B的which,是当先行词是一个范围时或是物时才用的