ten years ago they they ()pupils Awas B are C were

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ten years ago they they ()pupils Awas B are C were
ten years ago they they ()pupils Awas B are C were

ten years ago they they ()pupils Awas B are C were
C
ten years ago 十年前,一般过去时的标志,排除B,而主语是THEY 复数,再排除A

C
祝你学习进步,更上一层楼! (*^__^*)
不明白的再问哟,请及时采纳,多谢