AAlways since the creation of celluloid, Bplastics have been found Cto have Da multitude of industrial and commercial uses.

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问题 AAlways since the creation of celluloid, Bplastics have been found Cto have Da multitude of industrial and commercial uses.

选项 A、 
B、 
C、 
D、 

答案A

解析 always改为ever。ever since自从。
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