How many more decades will have to pass ____ scientists succeed in providing a cure for cancer?A．whenB．sinceC．beforeD．until-高中英语-n多题

◎ 题干

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

A．when

B．since

C．before

D．until

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◎ 解析

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◎ 知识点

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