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
Many girls like ______ skirts in spring.
A． wearing
B． dressing
C． putting on
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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