People are recycling many things which they      away in the past.
#66646
A
had thrown
B
will be throwing
C
were throwing
D
would have thrown
推荐题目
There is a new problem involved in the popularity of private cars ____________ road conditions need ____________. 
#74029
A
that; to be improved
B
which; to be improved
C
where; improving
D
when; improving
____ our mother will allow ____ to see a film after supper?
#69627
A
Who do you think; leaving
B
Who do you think; to leave
C
Do you think who; leaving
D
Do you think who; to leave