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---Is dinner ready?---Not yet. The main course ______. It needs another ten minutes.
#100637
A
was not done
B
had not done
C
is not done
D
has not done
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By the time he realizes the mistake he ________,it will be too late for him to do anything about it.
#102873
A
has made
B
made
C
makes
D
will make
The letters for the boss________on his desk but he didn’t read them until three days later.                                                             (2012·天津,2)
#99425
A
were put
B
was put
C
put
D
has put
We must try our best to         the river being polluted any more.
#101113
A
separate
B
keep
C
prevent
D
guard
The professor _______ to walk out of the office when one of his students came in.
#103194
A
was about to
B
was going to
C
would
D
was to
Nowadays, a large number of women, especially those from the countryside, ________ in the clothing industry.
#102332
A
is working
B
works
C
work
D
worked
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