单项选择题

I'll ______ that I'm a qualified engineer.

A．have you know
B．have known you
C．have you knowing
D．have you known
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单项选择题
After stopping for a few minutes, the bus moved ______ to its next stop.
A．forward
B．off
C．with
D．on
单项选择题
The teacher asked his students to leave enough ______ on the page for correction.
A．room
B．margin
C．place
D．paper
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