2. 外语
  3. Almost all metals are good conductors, silver _______the best of all.

Almost all metals are good conductors, silver _______the best of all.

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问题 Almost all metals are good conductors, silver _______the best of all.
选项 A、is
B、being
C、has been
D、is to be
答案B
解析 独立主格结构。逗号前后分句缺乏连词，空格处不能填入谓语动词构成独立分句，因此只能选B构成独立主格结构，表伴随状态，相当于Almost all metals are good conductors，and silver is the best of all．
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