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
--How often do you write to your uncle-- ______.
A． Once a month
B． In a month
C． For a month
单项选择题
Jim works hard on his Chinese and ______.
A． so Lucy does
B． so is Lucy
C． so does Lucy
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