Education is regarded as the key to (make) ______ progress.making在这里“to”不是动词不定式的

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问题 Education is regarded as the key to (make) ______ progress.

选项

答案 making

解析在这里“to”不是动词不定式的符号，而是介词，“the key to...”意为“……的关键”，所以本题要用make的动名词形式。

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