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1.——他昨天完成任务了吗?——是的,他完成了任务。误:——Did he finish the work yesterday?——Yes,he finished it.正:——Did he finish the work yesterday?——Yes,he did.
1. - Did he complete the task yesterday? - Yes, he completed the task. Wrong: - Did he finish the work yesterday? - Yes, he finished it. Right: - Did he finish the work yesterday? - Yes, he did.