求教Sandy could do nothing but (admit)to his teacher that he w

来源：学生作业帮编辑：大师作文网作业帮分类：英语作业时间：2024/10/05 19:13:06

求教
Sandy could do nothing but (admit)to his teacher that he was wrong
Sandy had no choice (admit)tohis teacher that he was wrong
The new machine,if (use)properly,will work for at least tenyears
谁来告诉我这三个空应该填括号内动词的什么形式?

Sandy could do nothing but 原形admit (admit)to his teacher that he was wrong
Sandy had no choice 动词不定式to admit (admit)tohis teacher that he was wrong
The new machine,if 过去分词used (use)properly,will work for at least tenyears
再问：为什么第一句和第二句不一样，明明都是非谓语，而且前面都是but第三句中，为什么used的前面不用加be？这好像是被动语态吧
再答：第一句等于could admit 第二句等于had to admit 第三句等于if it is used

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