Scientists say it may be five or six years______it is possible to test this medicine on human patients.

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问题 Scientists say it may be five or six years______it is possible to test this medicine on human patients.

选项 A、since
B、after
C、before
D、when

答案C

解析本题考查连词。it is／has been+时间段+since…表示“自从……以来有某段时间了”，since后面如果是从句往往用一般过去时；it was／will be／may be+时间段+before…表示“过了或者将过某段时间某事才发生”，it is+时间短语+when…中的when引导定语从句。

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本试题收录于：英语题库普高专升本分类

英语

普高专升本

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Scientists say it may be five or six years______it is possible to test this medicine on human patients.

英语

普高专升本

TheUnitedStatesandChinaarecompetingtowinthemostmedalsatthe2008Beijing0-lympicGames.Regardlessofwhichcountry

Earthquakesaresomethingthatmostpeoplefear.Therearesomeplacesthathavefewornoearthquakes.Mostplacesintheworld

Foreignersexperiencedifferentdegreesofcultureshock.Thesymptoms【B1】______fromgreattosmall.Somepeopleareonlyillat

ThenumberofspeakersofEnglishinShakespeare’stimeisestimatedtohavebeenaboutfivemillion.Todayitisestimatedthat

(2001)Lookingatthecloudymorningsky,themountainclimbersdecidedtoputofftheplan______thenextweekend.

Hehasbeencalledthe"missinglink"Half-man,half-beast.Heissupposedtoliveinthehighestmountainintheworld—Mount

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