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第1题

16. This latest theory has yet to be proved but seems to offer a better explanation ________ why Flight 19 and all the
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第2题

15. If the weather ______ more favorable in the past few months, the crops would be growing still better in a few days.
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第3题

14. Mr. Smith gradually _______ a knowledge of French when he lived in France. ( )(本题2.0分) A、 acquired B、 require
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第4题

13. In manufacturing, cheaper materials are constantly being _______ for the better and more expensive kind. ( )(本题2.0分
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