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科目： 來源：同步題 題型：單選題

While flying,a bat makes a sound which hits things and comes back to its ears. In this way it's able to know         the things are and avoid bumping into them.    
[     ]
A. how    
B. where    
C. what    
D. which

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科目： 來源：同步題 題型：單選題

_____Mary is busy, she always helps others.
[     ]
A. Although    
B. Since
C. Whether    
D. Unless

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科目： 來源：同步題 題型：單選題

He asks me         to use the computer.   
[     ]
A.why      
B.if      
C.whether   
D.what

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科目： 來源：同步題 題型：單選題

I don't know_________it will rain or not tomorrow.     
[     ]
A. how          
B. whether    
C.when        
D. that

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科目： 來源：同步題 題型：單選題

Peter likes readlig a newspaper _____he is having breakfast.   
[     ]
A. until    
B. while
C. because    
D. though

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科目： 來源：同步題 題型：單選題

―What can I do for you, sir?
—I really like this shirt. I wonder _________ you have a larger one. 
[     ]
A. if            
B. what
C. how much    
D. that

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科目： 來源：同步題 題型：單選題

—Your French is so good. How long have you been in France?
—_________ I was five.
[     ]
A. Until                          
B. Since
C. When                          
D. Before

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科目： 來源：同步題 題型：單選題

_____it's difficult to her dream come true,she never gives up.
[     ]

A. Though
B. Unless
C. Because
D. If

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科目： 來源：同步題 題型：單選題

_____ you don't want to do so, you have to do it.      
[     ]

A. Even                    
B. Though      
C. Even though              
D. Although

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科目： 來源：同步題 題型：單選題

You won't pass your exam_______you work harder.    
[     ]
A. when        
B. if        
C. unless      
D. after

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