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

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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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专业英语四级

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

专业英语四级

Inanysociety,nomatterhow【C1】,someindividualshaveauthority【C2】others,atleastwithinalimitedsphere.Obed

Mostworthwhilecareersrequiresomekindofspecializedtraining.Ideally,thechoiceofan【C1】should【C2】evenbefor

WhatwillNOTbediscussedbypoliticiansduringtheG8Summit?

WhatisthemainpurposeofMr.Lorden’svisitthistime?

Thedifferencebetweenaliquidandagasisobvious【C1】theconditionsoftemperatureandpressure【C2】foundatthe

Thedeanofourdepartmentproposedthatallthestudents______atthereceptionthisafternooninordertomeettherepresentat

Howmanyminersaretrappedunderground?

Scientistswhobelievecellphonesaredangeroushavebeenthrowingouthypothesestoexplainawaythenegativeresults.Maybes

Thecompanydecidedtoreducethenumberofworkers.Andtheirgroupwastargetedto______theburdenofjoblosses.

All______isacontinuoussupplyofthebasicnecessitiesoflife.

男性，50岁，因上山砍柴摔伤致休克而急送医院急诊科，病人面色苍白，四肢厥冷，为病人保暖下述措施正确的是（）

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