Experiments in the photography of moving objects______in both the united states and Europe before 1990.

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问题 Experiments in the photography of moving objects______in both the united states and Europe before 1990.

选项 A、have been conducting
B、were conducting
C、had been conducted
D、are conducted

答案C

解析该题测试考生的基本时态和语态概念。首先，这道题必须是被动语态。其次，试验是在1990年之前做的，所以必须用过去完成时态。

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本试题收录于： GCT工程硕士（英语）题库专业硕士分类

GCT工程硕士（英语）

专业硕士

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Experiments in the photography of moving objects______in both the united states and Europe before 1990.

GCT工程硕士（英语）

专业硕士

下列不属于犯罪的基本特征的是()。

Themediadirectorisresponsibleforthefollowingexcept.Thetechnologyconsultantwill.

Accordingtothepassage,somepeoplestartedanationalassociationsoasto______.Bysayingthatthebombalsohasadeterre

Accordingtotheauthor,thesystemofpowersharingbetweentheWhiteHouseandthegenerals______.Inthelastparagraph,th

Itisessentialforapolicemantobetrainedincriminallaw.Theeverydaylifeofapolicemanordetectiveis.

ThispassagemostlikelycamefromalongerworkaboutearlyAmerican______.Accordingtothepassage,thefirstsettlersused

A:Whatasurprise.Youhadyourhairpermed.B:Yes,andanothersurprise.I’mgoingtogetmarriednextSaturday.A:______.

Whenpeoplebecomeaging,theywilllosesomeoftheirabilitytobouncebackfromdiseaseandinjury,"bounceback"heremeans

Woman:HowcanwegetticketsfortheSunday’smovie?Man:______.

Itmightbesupposedthatgreaterefficiencycouldbeachievedifseveralpeopleworkedtogethertosolveaproblemthanifonly

英语名词bike(自行车)原来的形式是bicycle，这在词的形成方式上属于

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