单项选择题

Even if he()here, he would not be able to help us.

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

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单项选择题
The design was so()that you could not find any fault in it.

A. delicate  
B. elaborate 
C. fancy    
D. complicated
单项选择题
So fast()that it is difficult for us to imagine its speed.

A. light travels          
B. travels light<br>
C. do light travel   
D. does light travel
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