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题库解析   >   其他 题型   >   SC795-807题
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SC795-807题

By 1999, astronomers had discovered 17 nearby stars that are orbited bv planets about the size of Jupiter.


    A.had discovered 17 nearby stars that are orbited by planets

    B.had discovered 17 nearby stars with planets orbiting them that were

    C.had discovered that there were 17 nearby stars that were orbited by planets

    D.have discovered 17 nearby stars with planets orbiting them that are

    E.have discovered that 17 nearby stars are orbited by planets


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答案:
A

A 正确

B 句子成分WERE多余

C 多了谓语

D 时态错误

E 同D

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