______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

Materialabundancehasbeenthelifebloodwhichhas______Americansintheirbasicbeliefsandvalues.

Haveyoueverbeeninasituation______youknowtheotherpersonisrightyetyoucannotagreewithhim?

OnApril8thEnvisat,Europe’slargestEarth-observingsatellite,unexpectedlystoppedtalkingtoitsusersontheEarthbelow.

Marks&Spencerhasreportedaweaksixmonths’tradingjustasthecrucialcountdowntoChristmasbegins.First-halfpre-ta

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

Amarketiscommonlythoughtofasaplacewherecommoditiesareboughtandsold.Thusfruitandvegetablesaresoldwholesalea

Mr.Whiteworkswithachemicalsimport&exportcompany,buthe______fortheindustrialfair,sinceheisonleave.

Oneofthemostcriticalproblems【C1】_blackandotherminorityAmericanstodayisthedifficultyofentering【C2】_socie

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TheAustriaBigDry______.

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