Silveristhebestconductorofelectricity,
单项选择题 Silver is the best conductor of electricity, copper __________ it closely.
A.followed
B.following
C.to follow
D.being followed
正确答案：B
答案解析:考查非谓语动词。句意：银是最好的导电体，铜紧次之。copper与follow之间为主动关系，故用现在分词形式。
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