Through so much trouble，he learned everyone needed friendship and self confidence is impo

Through so much trouble，he learned everyone needed friendship and self confidence is important.
A. that；/
B. /；/
C. that；that
D. /；what

A. that；/B. /；/(答案→)C. that；thatD. /；what解析：考查宾语从句的连接词。 everyone needed friendship and self confidence is important.是两个并列的宾从，从句都不缺成分，所以用that引导，第一个that可以省略，第二个不可少，所以选C。

我也是这个答案