单项选择题

When must they work out the problems


[A] Tomorrow. [B] Now. [C] Next week.
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单项选择题
It ______ heavily so there was deep snow on the road.
[A] snows
B. snowed
C. had snowed
单项选择题
Betty said that______all her friends，Mary was her favorite．
[A] between
B. of
C. in
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