Plastics are the best insulator of electricity, rubber______it closely.A、followi

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问题 Plastics are the best insulator of electricity, rubber______it closely.

选项 A、following
B、followed
C、to follow
D、being followed

答案 A

解析 rubber following it closely为分词独立结构，放在主句之后，提供进一步的细节情况。

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