(2013·四川省乐山一模)The pupils were playing games in the classroom ________ a gunman entered and began shooting wildly at them.
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A
while
B
when
C
as
D
before
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The baby, ________health was ruined after taking the medicine, was only one year old.
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Helen plays the violin ________, if not better than, Kate.
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as well
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Most of the Europeans refuse to accept GM food ______Americans regard it as the fruit from high tech.
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