The best way to prevent the air polluting _____ , but the sky is still not clear.
#102116
A
is used
B
are used
C
has been used
D
have been used
推荐题目
—Were you surprised by the ending of the film? ----No. I ______the book, so I already knew the story.
#101569
A
was reading
B
am reading
C
have read
D
had read
——Can I join your club,dad? ——You can when you______a bit older.
#103502
A
get
B
will get
C
are getting
D
will have got
Father ____ for London on business upon my arrival, so I didn’t see him.
#100323
A
has left
B
left
C
was leaving
D
had left
—Have you forgotten anything，sir? —Oh，I forgot to pay.You see，I'm terribly sick，but I ______ to.
#104345
A
didn't mean
B
don't mean
C
haven't meant
D
wasn't meaning
—Did Alan enjoy seeing his old friends yesterday?—Yes, he did. He __________ his old friends for a long time.
#104601
A
didn’t see
B
wouldn’t see
C
hasn’t seen
D
hadn’t seen