Scientists say it may be five or six years______this medicine is tested on human beings.

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问题 Scientists say it may be five or six years______this medicine is tested on human beings.

选项 A、since
B、before
C、after
D、when

答案B

解析本题为固定用法题。本句意为“科学家们称，可能五六年之后这种药物才能用在人身上”。“It may be…before”表示“可能过多久才……”，故选项B)为正确答案。

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成人本科学位英语

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Scientists say it may be five or six years______this medicine is tested on human beings.

成人本科学位英语

Noonegetsoutofthisworldalive,andfewpeoplecomethroughlifewithoutatleastoneseriousillness.Ifwearegivenase

Ifeelsurethat______qualification,abilityandexperience,youareabundantlysuitedtothepositionwehaveinmind.

Mymotherwasavocalsupporterofphysicalpunishment,butforallhertalkingshehasneverhitmysister,andmeonlyonce.I

"Freshmanfifteen"isatermwhichmeansfifteenpounds,oraboutsevenkilograms—theweightstudentsmightexpecttogainint

Doyouknowinsurance(保险)?Buyinginsuranceisa【C1】______bywhichpeoplecanprotectthemselvesagainstlargelosses.Protectio

Air,or()iscalledatmosphere,surroundsthewholeearth.

Jane:Firstly,allowmetointroducemyself.MynameisJane,managerofthecompany.Tom:______

Thefossilremainsofthefirstflyingvertebrates,thepterosaurs,haveintriguedpaleontologistslormorethantwocenturies.

Arnold:IwasrecentlydeniedasealonanairlineflightforwhichIhadaconfirmedreservation,becausetheairlinehadoverb

SomebiographershavenotonlydisputedthecommonnotionthatEdgarAllanPoedranktoexcessbutalsoquestionedwhetherhedr

A．鼻皮样囊肿B．无鼻C．后鼻孔闭锁D．鼻筛面裂囊肿E．鼻裂胚胎发育过程中鼻颊膜或颊咽膜遗留

犬肾上腺皮质机能减退的主要原因是

“申报日期”栏应填()。“提运单号”栏应填()。

在有关货币时间价值指标的计算过程中，普通年金现值与普通年金终值是互为逆运算的关系。()

心理健康表现为个人具有生命的活力，积极的内心体验和良好的()

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【B1】【B4】