Scientists say it may be five or six years ________ it is possible to test this

Scientists say it may be five or six years ________ it is possible to test this

题型:天津同步题难度:来源:
Scientists say it may be five or six years ________ it is possible to test this medicine on human patients.  [      ]
A. since    
B. after    
C. before    
D. when  
答案
C
举一反三
We hired a boat __     we could go fishing on the   weekend.[     ]
A. in order to                   
B. so as to
C. in order                      
D. so that
题型:同步题难度:| 查看答案
Jack wasn " t saying anything but the teacher smiled at him _____ he had done something very clever. [     ]
A. as if                
B. in case  
C. while              
D. though
题型:同步题难度:| 查看答案
The school rules state that no child shall be allowed out of the school during the day,__________
accompanied by an adult.   [     ]
A. once              
B. when  
C. if                  
D. unless
题型:同步题难度:| 查看答案
_________I meet him, I always think of the things which happened between us.[     ]

A. Every time        
B. For the time  
C. The night          
D. At no time

题型:同步题难度:| 查看答案
The  wise  parents  can  tell  whether their children are telling the truth __________ they listen
to their excuses to wrong deeds.  [     ]
A. the first time   
B.for the first time  
C.every time  
D. for every time
题型:同步题难度:| 查看答案
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