America will never again have as a nation the spirit of adventure as it _____ before the West was settled. A.coul D. B.di

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America will never again have as a nation the spirit of adventure as it _____ before the West was settled.A.coulD.B.di

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单选题

( )you start，you will never give up.

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单选题

The earthquake broke out on a day______ my father left for America, a day _______ I’ll never forget.

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It is no arguing with Tom because he will never change his mind.

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单选题

It will never be _____ profitable to exploit the seabeds, no matter how great the riches to be found there.

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