2. 外语
  3. Upon arriving home the girl discovered that she ______ (leave) her bag at her friend’s.

Upon arriving home the girl discovered that she ______ (leave) her bag at her friend’s.

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问题 Upon arriving home the girl discovered that she ______ (leave) her bag at her friend’s.
选项
答案had left
解析 本题考查动词的时态。分析句子结构可知，that引导宾语从句，说明discover的具体内容。而谓语动词discovered是一般过去时，从句部分谓语动词leave(her bag)发生在discover这一动作之前，因此从句谓语动词应该用过去完成时(had done)，此处应填had left。
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