6.Students are given a lot of exercises to do,_______ to imp

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6.Students are given a lot of exercises to do,_______ to improve their grades.A.aimed B.aiming
C to be aimed D to aim 麻烦给出答案并解释为什么

答案：A
句意：学生们被留了许多作业去做,目的在于提高他们的成绩.
解析：考点在于非谓语动词的使用.
整个句子的主语是students,非谓语动词中,过去分词表示被动关系,现在分词表示主动关系,动词不定式表示将来的动作.
根据句意,学生被留了作业,明显是老师留的作业,所以老师的目的是提高他们的成绩,因此aim这个动作是老师发出的,而非主语students发出,它是这个动作的执行者,因此是被动形式,排除B.
另外,动词不定式表示将来,CD的意思就是将来的目的是.,老师留作业,在留作业的时候就存在提高学生成绩的目的,因此aim这个动作不是将来才发生的.淘汰CD
ps：这道题目在网上许多卷子里都有出现,给的就是A
无疑后请采纳.
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