He let me repeat his instruction ________ sure that I understood what was ________ after he went away.
A.to make; to be doneB.making; doingC.to make; to doD.making; to do在线课程A
题目的四个选项有两项是不定式,另两个为现在分词。这里表达的是前面动作的目的而不是伴随情况,因此,很容易就可以排除B、D两项。从后面看,句子的主语是要做的事情,动词不定式应当使用被动形式。动词不定式和分词是英语学习中的重点和难点,在学习时,一定要系统地理解和掌握它们的用法。
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