I think is meaningful to help other people.A. itB. thisC. thatD. /

问题补充：

I think is meaningful to help other people.

A. it

B. this

C. that

D. /

答案：

(答案→)A. it

B. this

C. that

D. /

解析：考查宾语从句。句意“我认为帮助他人时很有意义的。”think后跟宾语从句，省略了引导词that。It is+adj. to do sth.是固定句型。故选A。