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    【题目】Scientists have many theories about how the universe________into being.
    A.came
    B.was coming
    C.had come
    D.would come

    【答案】A
    【解析】句意为：关于宇宙是如何产生的，科学家们有很多理论。根据句意可知宇宙产生绝非将来要发生的事，所以先排除B、D两项，C项had come为过去的过去，因题中无过去时间作参照，故排除。宇宙产生发生在过去，故用一般过去时。

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