单项选择题
—It's so noisy upstairs. What are they doing
—They be having a party.
A．could
B．should
C．must
D．would
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单项选择题
Everyone tried to find an answer to the problem, but ______of them could do it.
A．none
B．neither
C．each
D．all
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单项选择题
This box is______ that one.
A．twice big than
B．twice bigger
C．twice as big as
D．twice more big than
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