______ the students found the soldier's idea interesting, the system was too difficult to be
of practical use.   
[     ]
A. While      
B. Unless       
C. As soon as      
D. Even if
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科目：高中英語(yǔ) 來(lái)源： 題型：

On the street I saw a studen _____ I thought was English.

　 A. whom 　 B. who

　 C. the one 　 D. he

 

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