All possible means ___ been tried to stop the air______.
#103381
A
has, polluted
B
have, polluting
C
have, being polluted
D
has, being polluted
推荐题目
When I come in, I found a strange girl ______in the corner.
#103163
A
seating
B
seated
C
to be seating
D
seat
—Ring me at six tomorrow morning ,will you?—Why that early? I_____.
#100884
A
will be sleeping
B
have slept
C
have been sleeping
D
will sleep
Peter had intended to take a job in business, but____ that plan after the unpleasant experience in Canada in 2010.
#100986
A
had abandoned
B
abandoned
C
abandon
D
will abandon
Jack doesn’t smoke now, but he _______ for almost twenty years.
#101447
A
was smoking
B
had smoked
C
has smoked
D
smoked
As a student, I want to use my creativity to _____ possible solutions to the problems I meet with.
#99114
A
explain
B
express
C
ignore
D
explore