Experiments in the photography of moving objects ______ in both the United States and Europe well before 1990.

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问题 Experiments in the photography of moving objects ______ in both the United States and Europe well 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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在职攻硕英语联考

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Experiments in the photography of moving objects ______ in both the United States and Europe well before 1990.

在职攻硕英语联考

Beingamanhasalwaysbeendangerous.Thereareabout105malesbornforevery100females,butthisratiodropstonearbalanc

WhenIdecidedtoquitmyfulltimeemploymentitneveroccurredtomethatImightbecomeapartofanewinternationaltrend.

Bythemid-nineteenthcentury,theterm"ice-box"hadenteredtheAmericanlanguage,buticewasstillonlybeginningtoaffect

Ithasbeenarguedthatwhereschoolsbecomebureaucratized,theybecomeboundupwiththetechniquesandimplementationofthe

WhydosomanyAmericansdistrustwhattheyreadintheirnewspapers?TheAmericanSocietyofNewspaperEditorsistryingtoans

Thirty-onemillionAmericansareover60yearsofage,andtwenty-ninemillionofthemarehealthy,busy,productivecitizens.B

Shopperswhohaveflockedtoonlinestoresfortheirholidayshoppingarelosingprivacywitheverymouseclick,accordingtoa

Althoughpunctualhimself,Dr.Smithwasquiteused______latefortheappointments.

Standardusageincludesthosewordsandexpressionsunderstood,used,andacceptedbyamajorityofthespeakersofalanguagei

Textinghaslongbeenbemoaned(哀叹)asthedownfallofthewrittenword,“penmanshipforilliterates,”asonecriticcalledit.

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