This robot is supposed to save a lot of labor, but it remains a problem if it _____

◎ 题干

This robot is supposed to save a lot of labor, but it remains a problem if it ______.

A．is

B．saves

C．does

D．has

◎ 答案

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◎ 解析

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◎ 知识点

根据魔方格专家分析，试题“This robot is supposed to save a lot of labor, but it remains a problem if it ______.A．isB．savesC．doesD．has…”主要考查了你对【一般现在时】，【过去进行时】，【过去完成进行时】等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。

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