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How many decades will have to pass scientists succeed in providing a cure for ca

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How many decades will have to pass scientists succeed in providing a cure for ca

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

[]A．

until

B．

when

C．

before

D．

since

试题答案

答案：C

标签：passtosucceedscientistshave

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