2. 外语
  3. Plastics are the best insulator of electricity, rubber____it closely.

Plastics are the best insulator of electricity, rubber____it closely.

admin2015-01-09  21
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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