单项选择题

He didn't know ______ is more difficult between maths and physics.

A．which
B．that
C．where
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单项选择题
From her words we realized that she was really looking forward to ______ us.
A．hearing from
B．hearing about
C．hear from
单项选择题
When everyone was ______ , the meeting began in the meeting room.
A．sit
B．seated
C．seating
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