单项选择题

He ______ into the office building when the fire bell rang.

A．was going
B．goes
C．has gone
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单项选择题
A．byB．notC．without
A．by
B．not
C．without
单项选择题
I think English is ______ maths
A．very difficult than
B．so difficult as
C．much more difficult than
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