单项选择题

If something happens that stops you from keeping the appointment, you can change or cancel the appointment at once（）

A．如果某事突发，使你不能如期约会，你应该迅速对改变或取消约会做出反应。
B．假如有防碍你约会的事出现，你最好做出更改或取消约会的抉择。
C．假如有事需你另行约会，你可以改变时间或及时进行约会。
D．假如你有事不能按时赴约，可以立即改变或取消约会。

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How can we say the blackout of 1977 not really a repeat performance（）

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In the first paragraph some people are shy means（）

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