单项选择题

The departure time of the plane has been postponed, so we have nothing to do now but ______.

A．wait
B．to be waiting
C．to wait
D．waiting
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单项选择题
As a lawyer he spent a lot of time（） investigations.

A. conducted    
B. to conduct     
C. conduct     
D. conducting
单项选择题
The best title of this passage can be（）

A. Effect of Education
B. Dependence on Environment
C. Intelligence
D. Surroundings
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