单项选择题

It is not polite to ______a speaker when he is making a speech.

A．interrupt
B．cease
C．oppose
D．inquire
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单项选择题
No sooner had Tom seen Jim ______he left the room.
A．when
B．before
C．than
D．then
单项选择题
The Yellow River is the second （）river in China.

A. long
B. longer
C. longest
D. most long
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