Scientists have many theories about how the universe_____.
#101876
A
came into being
B
was coming into being
C
had come into being
D
would come into being
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A new study finds that sitting can shorten a person’s life almost as much as smoking can, which _______ just how damaging inactivity can be.
#99878
A
estimates
B
highlights
C
dominates
D
ensures
–Why, David, you look so tired! –Well, I ______ a report for the whole day and I must finish it tomorrow.
#101962
A
was writing
B
will be writing
C
have written
D
have been writing
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
Had it been possible, I would have gone to attend Monica in the hospital, but I fully occupied last month.
#101541
A
had been
B
was
C
am
D
have been
I ______, but I was prevent by the heavy rain.
#104168
A
had meant coming
B
had meant to come
C
meant to come
D
meant coming