. Tom as well as his classmates __________ a song when the teacher came into the classroom.
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A
are singing
B
were singing
C
is singing
D
was singing
推荐题目
 Jack could have avoided that terrible car accident, but he ________ careful enough.
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A
is not
B
hasn’t been
C
was not
D
hadn’t been
Who do you think ________ for the accident?
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A
to blame
B
to be blamed
C
is to be blamed
D
is to blame
The news came as no surprise to me, for I _______of it earlier.
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A
hear
B
heard
C
had heard
D
have heard