单项选择题

Louis Herman, at the University of Hawaii, has () a series of new experiments in which some animals have learned to understand sentences

A. installed
B. devised
C. formatted
D. equipped

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()had we sat down than the telephone rang.

A. Almost    
B. No sooner    
C. Hardly     
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Most of the people ()to the reception are old friends.

A. to invite               
B. being invited  
C. invited                
D. inviting
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