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
The old woman kept one black dog and two white ______.
A．one
B．ones
C．those
单项选择题
Many girls like ______ skirts in spring.
A．wearing
B．dressing
C．putting on
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