Howmanymoredecadeswillhavetopa

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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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相关试题

—I usually go there by train.
—Why not __________ by boat for a change?

A．to try going	B．trying to go
C．to try and go	D．try going

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Having been ill in bed for nearly a month, he had problems __________ the exam.

A．pass	B．passing
C．to pass	D．passed

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It was so dark that he __________.

A．didn't dare to go out to fetch some water

B．not dared to go out to bring some water

C．dares not to go out to bring some water

D．not dare to go out to fetch some water

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The Wangs are considering __________ to Huangshan for a trip at five tomorrow morning.

A．to move off	B．moved off
C．moving off	D．move off

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The rule is true __________ all cases.

A．about	B．on
C．of	D．to

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