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.andsilver is the best of all.
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