He thinks _____ history about Chinese is very important. 
#49013
A
studied
B
studying
C
studies
D
study
推荐题目
The old man was too poor ___________a room _________ . 
#48825
A
have; to live
B
to have; live
C
to have; to live
D
to have; to live in
There are some boys ________ in the river.
#51303
A
swimming
B
to swim
C
are swimming
D
is swimming