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    精英家教网 > 初中英语 > 题目详情

    I________look after my little brother at home that day because Mother was out．


    1. A.
      have to
    2. B.
      must
    3. C.
      had to
    4. D.
      needn't
    C
    分析：句意是“因为妈妈出去了，我那天得在家里照顾小弟弟。”，表示的概念是“必要性”，D项needn't是“不必要”，不符合句意。have to，must，had to都可以表示“必要性”，由于本句是指过去的事情，所以不能用have to(一般现在时)，must．(没有过去式)，要用C项的had to(是have to的过去式)。(延伸)have to和must都表示“必要性”，但两者是有区别的。1)must只有一个时态，用于表示现在的必要性，但也可以用来表示将来的必要性，如：We must study hard．(指现在)You must come here tomorrow．(指将来)但是have to有多种时态(常用一般现在时、一般过去时、一般将来时)，如：You will have to come tomorrow．(注意避免说成You have to come here tomorrow．)因此在表示过去的必要性时，一般要用had to，不用must(但在间接引语中仍然可以用must)．2)否定结构时属于不同的概念，mustn't表示的是“不许可”“不允许”的意思，而don't have to的否定形式表示的是“不必要”。3)must有别的用法(表示“可能性”的非常肯定的推测)，而have to只能表示“必要性”。4)表示“必要性”时，用must表示的是说话人的主观看法，而have to表示的是客观需要，如：I have to leave now．You must come here tomorrow．
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    1.

    A．be health

    B．be healthy

    C．in healthy

    D．in health

     

    2.

    A．too many

    B．too much

    C．many too

    D．much too

     

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    A．be

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    C．am

    D．are

     

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    A．for

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    A．quiet

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    D．stressed out

     

    6.

    A．little

    B．much

    C．more

    D．less

     

    7.

    A．places

    B．cities

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    8.

    A．have

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    9.

    A．difficult

    B．important

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    10.

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    11.

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    13.

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    14.

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    D．helps me getting good grades

     

    15.

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    B．exercises

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    D．to exercise

     

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