—Is there any possible way to help them get rid of such a bad habit?—To tell the truth, it’s very hard. But we ________ on this problem, trying to improve the situation .
#101218
A
worked
B
had worked
C
are working
D
had been working
推荐题目
---What’s that noise? ---Oh, my God! I ________ to turn the tap off after I brushed my teeth.
#102233
A
forget
B
forgot
C
was forgetting
D
had forgotten
A fully-grown blue whale _____ 110 feet in height and _____ several tons.
#101038
A
is measured; weighs
B
measures; weighs
C
is measured; is weighed
D
measures; is weighed
from the top of the tower ,the south foot of the mountain is a sea of trees.
#102030
A
Seen
B
Seeing
C
Having seen
D
To see
—Beg your pardon, but I didn’t quite catch what you said.—Oh, I to myself.
#101947
A
have talked
B
am talking
C
had talked
D
was talking