单项选择题

The thought () he might be a scientist some day encouraged him to study hard.

A. whether      
B. that     
C. how     
D. why

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Peter didn't understand the problem until I () him

A. advised              
B. acquainted 
C. enlightened           
D. communicated
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Hangzhou,()we spent last spring, is one of the most beautiful cities in China.

A. where
B. which
C. that
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