单项选择题

As a lawyer he spent a lot of time（） investigations.

A. conducted    
B. to conduct     
C. conduct     
D. conducting

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单项选择题
The new invention is to make our daily life easier, () it more difficult.

A. not to make   
B. not make      
C. not making    
D. do not make
单项选择题
I don’t mind () out for a walk in such bad weather.

A. go       
B. to go       
C. going      
D. gone
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