题目内容

5.I'm expecting a pet dog for long,but mom has no time to buy            for me.(  )
A.itB.oneC.thisD.that

分析 我期望得到一只宠物狗好久了,但是妈妈没有时间给我买一只.

解答 答案B
it意为"它"指的是前面出现的那个事物,也就是同类同物;one意为"一个",指的是同类事物中的一个,也就是同类异物.this意为"这个";that意为"那个"根据"I'm expecting a pet dog"以及"buy            for me"可知妈妈没时间给我买一只宠物狗,不是特定的什么宠物狗,所以要用one,指的是同类异物.故选B.

点评 首先要掌握it,one,this,that这几个不定代词的用法,然后结合具体的句子做出正确选择.

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