单项选择题

This maths problem is ______ that one.

A．so easy as
B．as difficult as
C．much difficult than
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单项选择题
He is thirsty. Please give him some ______ to drink.
A．rice
B．meat
C．water
单项选择题
--Must I stay at home and take care of her --No, you ______.
A．mustn't
B．can't
C．needn't
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