单项选择题

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

A．goes
B．has gone
C．was going
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单项选择题
-- Hello! How are you-- ______.
A．Fine. Thank you. And you
B．How are you
C．Hello.
单项选择题
What's this ______ English
A．an
B．in
C．on
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