______electric wires are made from copper or lead is common practice.A、WhatB、Wh

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问题 ______electric wires are made from copper or lead is common practice.

选项 A、What
B、Whether
C、That
D、How

答案 C

解析主语从句题。句子主语为——electric wires are made from copper or lead。句子谓语为is common practice。当主语从句结构、意义完整时，用that引导，尽管that不作任何成分，没有意义，但不能省略。

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