单项选择题

How did all these______

A．come out
B．come up
C．come across
D．come about
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单项选择题
She can't help______the report because she's busy answering phones.
A．to write
B．writing
C．to writing
D．be written
单项选择题
It was the holding of the APEC conference______made Shanghai the focus of the world.
A．that
B．which
C．what
D．when
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