A(Always) since the creation of celluloid, B(plastics) have been found C(to have) D(a multitude) of industrial and commercial us

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问题 A(Always) since the creation of celluloid, B(plastics) have been found C(to have) D(a multitude) of industrial and commercial uses.

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答案A

解析 always改为ever。ever since自从。

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