The number of private cars in urban areas should be limited ___________the number of public buses should be increased.
#31434
A
when
B
while
C
unless
D
until
推荐题目
I was on the highway _______ this car went past followed by a police car. They ______ at least 150 kilometers an hour.
#32322
A
when; should have been driving
B
while; would have driven
C
as; could have driven
D
when; must have been driving
He didn’t put the things ____they belonged, for ____he got his punishment. 
#30091
A
which; that
B
what; this
C
that; whose
D
where; which