Several students were working _____the difficult math problem after class.      

Several students were working _____the difficult math problem after class.      

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Several students were working _____the difficult math problem after class.        [     ]
A. in        
B. to    
C. off        
D. on
答案
D
举一反三
Global warming leads _________the melting of  ice caps.     [     ]
A. on            
B. in
C. at            
D. to
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基本语法选择合适的介词填空                         
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on,  in,  at
May I ask you _____ questions _____ the Tyrannosaurus Rex?
[     ]
A. any; with          
B. some; about
C. any; for          
D. any; of
The two friends met a bear while they were walking _____ the forest.
[     ]
A. through        
B. in
C. to              
D. from
_____ you think _____ the movie? 
[     ]
A. What; of      
B. How; of
C. What; /        
D. How; /