How many more decades will have to pass______ scientists succeed in providing a cure for cancer?

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问题 How many more decades will have to pass______ scientists succeed in providing a cure for cancer?

选项 A、when
B、since
C、before
D、until

答案C

解析 before常可用于将来时态，表示“才；就”，如：It will be several weeksbefore you are used to the new life in college．几个星期后你就会适应大学里的新生活了。 A．when一般不与将来时态连用；B．since常与现在完成时连用；D.until直到，用在此处意义不符。

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英语

普高专升本

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How many more decades will have to pass______ scientists succeed in providing a cure for cancer?

英语

普高专升本

Itisdifficulttounderstandthiskindof______calculation.

ProfessorSmithrecentlypersuaded35people,23ofthemwomen,tokeepadiaryofalltheirabsent-mindedactionsforafortnig

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Althoughhehadlookedthroughallthereferencematerialonthesubject,hestillfoundithardtounderstandthispointandhe

Thereareagreatmanycareersinwhichtheincreasingemphasisisonspecialization.Youfindthesecareersinengineering,in

Allflights______becauseofthesnowstorm,wedecidedtotakethetrain.

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