单项选择题

-- Would you like to come to my home this Saturday evening
-- I'd like to, ______I'm too busy.

A．and
B．but
C．so
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--Is Beijing the ______ city in China--Maybe, I'm not sure.
A．big
B．bigger
C．biggest
单项选择题
--What time does school begin everyday--It ______ at eight.
A．begin
B．is beginning
C．begins
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