单项选择题

A good deal of research is being carried out nowadays （） the cause of juvenile crime.It is obvious that one of these is an unsatisfactory home background.

A.about
B.on
C.into
D.over

<上一题 目录 下一题>
热门 试题

单项选择题
I should like to （）to the theater with you yesterday，but I didnt have time.

A.go
B.have
C.going
D.be
单项选择题
The policeman() the thief and found the wallet.
A. searched for
B. searched
C. looked for
D. looked up
相关试题