单项选择题
No sooner had Tom seen Jim ______he left the room.
A．when
B．before
C．than
D．then
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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
Nobody can touch that box without permission because there is ______in it.
A．an important information
B．some important information
C．some important informations
D．lots of information important
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