Carbon dioxide ___ from burning fuels is the most common of the so-called greenhouse gases.
#4678
A
producing
B
having been produced
C
to be produced
D
produced
推荐题目
.The horses________each other________the first prize in the match. 
#4781
A
competed against; for
B
competed against; to
C
completed against; for
D
completed; to get
-- I’d like to invite you to watch a movie, INCEPTION, this Saturday, Samantha. --_____________________.
#4608
A
Oh, no. I really go wild about movies.
B
I’d rather have a day off.
C
That’ll be a good point.
D
I’m very sorry, but I really don’t feel in the mood for movies.
But for their help, we ____ the program in time.
#4795
A
can not finish
B
will not finish
C
had not finished
D
could not have finished