There es a time in every man's life .
A. that he needs to think
B. when he has to think
C. therefore he has to work hard
D. then he will need it
网友回答
A. that he needs to think
(答案→)B. when he has to think
C. therefore he has to work hard
D. then he will need it
解析：定语从句。此处先行词为a time后面的句子对它进行修饰。