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    • She had to be in hospital () three weeks

    括号内填at还是on

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    第1个回答  2020-10-07

    She had to be in hospital for three weeks.   在医院呆上三周。一段时间用介词for.

    at和on，用在这里不合适。

      She had to be in hospital on Monday.

      She had to stay in hospital at three o'clock.

    第2个回答  2020-10-07
    一段时间for
    第3个回答  2020-10-07
    这个句子缺少的介词不能用你给的这2个介词，因为后面的是时间段，表示不得不住院3周，时间段前面的介词用for，简称for段
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