【单选题】【消耗次数：1】
Is _____ possible to fly to the moon in a spaceship?
①
now
②
man
③
that
④
it
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The ____ problem of bring a spaceship back from the moon has been solved.
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technical
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technological
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【单选题】
The _____problem of bringing a spaceship back from the moon has been solved.
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①
as fifty time big
②
fifty times as big
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as big fifty times
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