单项选择题

There was a terrible （） as the crowd waited to hear who had been killed in the

accident.<br>  
A. impression  
B. diffusion   
C. tension   
D. stimulation

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Computers can be designed （） many automation processes purposes.

A. to      
B. in      
C. on      
D. for
单项选择题
-Nice to see you. I （）you for a long time. -I （）in Berlin. I've just got back.

A. didn't see, am
B. wasn't seeing, am
C. hadn't see, have been
D. haven't seen, was
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