A1l flights _________ because of the heavy storm, so we decided to take the train.
#100045
A
have canceled
B
have been canceled
C
had canceled
D
had been canceled
推荐题目
 —What’s the noise?   —Oh, I forget to tell you. The new machine     .
#99908
A
has been tested
B
is tested
C
will be tested
D
is being tested
I’ll go to bed as soon as my homework______.
#103981
A
do
B
does
C
are done
D
is done
I have been working here since I _______ this new position.
#101688
A
offered
B
have offered
C
was offered
D
had been offered
Great changes in every field _____ in the last ten years. 
#99202
A
take place
B
took place
C
have taken placed
D
had taken place