单项选择题

Mr. Smith has to go to Beijing on business, ______

A．hasn't he
B．has he
C．isn't he
D．doesn't he
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单项选择题
Is there ______ wrong with my watch No, ______.
A．something; nothing
B．nothing; everything
C．anything; nothing
D．everything; nothing
单项选择题
The teacher asked students ______.
A．stop speaking
B．to stop speaking
C．stopping speaking
D．stops smoking
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