填空题

Unless invited to speak, you should remain (silence)______at the conference.

【参考答案】

silent
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单项选择题
A．She likes cars．B．A car is necessary．C．Secondhand cars are better．D．She doesn’t like cars．
A．She likes cars．
B．A car is necessary．
C．Secondhand cars are better．
D．She doesn’t like cars．
填空题
as long as
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