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

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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
单项选择题
Water pollution, together with old tins and other forms of garbage, （） many problems in our large, industrial city today.

A．is causing
B．have caused
C．have been causing
D．are caused
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