---Bad luck! I ________ the sidewalk when an Audi cut in and knocked me down.---You can never be too careful!
#101153
A
crossed
B
have crossed
C
was crossing
D
had been crossing
推荐题目
Although medical science________control over several dangerous diseases，what worries us is that some of them are recurrent.
#99174
A
achieved
B
has achieved
C
will achieve
D
had achieved
Walmart，which is one of the largest American supermarket chains，________ some of its stores open 24 hours on Mondays through Saturdays.(2012·安徽)
#99568
A
keeps
B
keep
C
have kept
D
had kept
Good heavens! There you are! We _____ anxious about you, and we _____ you back throughout the night.
#104714
A
are; expect
B
were; had expected
C
have been; were expecting
D
are; were expecting
—How long in America?—Two years. I came back last month.
#101175
A
have you studied
B
do you study
C
would you study
D
did you study