单项选择题

--Is Beijing the ______ city in China--Maybe, I'm not sure.

A． big
B． bigger
C． biggest
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单项选择题
He always arrives here late,______
A． is he
B． isn't he
C． doesn't he
单项选择题
We all knew that the earth ______ around the sun.
A． went
B． goes
C． go
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