By the time the police came to rescue the old woman, she _______for four days under the house.
#102738
A
buried
B
had buried
C
had been buried
D
has been buried
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When he ________ the door，he found his keys were nowhere.
#99503
A
would open
B
opened
C
had opened
D
was to open
China's present environment situation is from bad to worse and if we _________ now to protect the environment, we’ll live to regret it.
#99934
A
hadn’t acted
B
haven’t acted
C
don’t act
D
won’t act
Why did you just sit and watch? You _______ me.
#104478
A
could help
B
should help
C
could have helped
D
must have helped
Since Jack was laid off from his job three months ago, he a new one, but without luck.
#100320
A
1ooked for
B
had looked for
C
is looking for
D
has been loking for
Tommy was planning to buy a car the next week,______ he ______ enough for a used one．
#101599
A
by that time; had saved
B
by which time; had saved
C
by that time; saved
D
by which time; has saved