There is a new problem ---- in the popularity of private cars ---_英语解答

There is a new problem ---- in the popularity of private cars ----road conditions need to be improv
A.involving;that B.involved;that C.involved;where D.involving;which
选B为什么,A怎么不行

人气：160 ℃　时间：2020-05-01 00:55:57

解答

C involved,where
involved 因为后面有 in
where 连接