单项选择题

A number of students in this class （）to Beijing once or twice.

A. were      
B. have been    
C. is     
D. has been

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单项选择题
The computer doesn’t work well, so something （） wrong.

A. can have gone            
B. should have gone
C. must have gone            
D. ought to have gone
单项选择题
Five miles （）a long distance to an old lady of her age.

A. seem to being 
B. seem to be    
C. seems to being  
D. seems to be
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