单项选择题

Without air, the night time （） very cold and the days burning hot.

A．be
B．would be
C．is
D．will be

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单项选择题

A couple of minutes earlier, （） we could have been able to hear his speech.

A．and
B．on
C．but
D．so

单项选择题

（） in the earthquake thoroughly, the city has now been rebuilt.

A．Destroying
B．Having destroyed
C．Destroyed
D．To be destroyed

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