We _______ on it for several hours but we have not yet reached any conclusion.
#104695
A
work
B
areworking
C
havebeenworking
D
havebeenworked
推荐题目
—What’s that unpleasant noise?—Oh, the road before the main gate          .
#102240
A
is repairing
B
is being repaired
C
is repaired
D
has been repaired
I want to buy that kind of cloth because I _____ the cloth ____ well. 
#104487
A
have told; washes
B
have been told; washes
C
was told; washed
D
have been told; is washed
—Hey! What's the rush?—The plane ________ at 4∶00 and I need to see my uncle off.
#101263
A
takes off
B
will take off
C
has taken off
D
took off