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    When she came out, Mary looked a bit tired because she the house.A. cleaned B. was C. had cleaned D.had been cleaning [解析]D:本题考查动词时态.侧重说明在she came out之前的动作.D项为过去进行时.表示从过去某一时间开始到过去某一时间一直进行的动作. 【查看更多】

     

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    When she came out, Mary looked a bit tired because she _____the house.

    A. cleaned  B. was  C. had cleaned  D.had been cleaning

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    .When she came out, Mary looked a bit tired because she _____the house.

    A. cleaned          B. was           C. had cleaned        D.had been cleaning

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    When she came out, Mary looked a bit tired because she ____ the house.

      A. cleaned                 B. was cleaning             C. had cleaned                     D. had been cleaning

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    When she came out, Mary looked a bit tired because she     the house.

    A. cleaned   B. was cleaning    C. had cleaned      D. had been cleaning

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    .When she came out, Mary looked a bit tired because she _____the house.

    A．cleaned

    B．was

    C．had cleaned

    D．had been cleaning

     

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