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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I don't need any help. Mind ______ own business, please.
A．my
B．one's
C．your
单项选择题
—What will you do tomorrow —I' II go ______ tomorrow.
A．fishing
B．fish
C．to fish
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