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第1题

This latest theory has yet to be proved but seems to offer a better explanatio________ why Flight 19 and all the other p
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第2题

If the weather ______ more favorable ithe past few months, the crops would be growing still better ia few days.
· was
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第3题

Mr. Smith gradually _______ a knowledge of French whehe lived iFrance.
· acquired
· required
· achieved
· at
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第4题

Imanufacturing, cheaper materials are constantly being _______ for the better and more expensive kind.
· replaced
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