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

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

选项

答案to making

解析 the key to后面接动名词形式或是名词，这里to是介词。例如：the key to the door，“门钥匙”；或the key to the heart，“开启心灵的钥匙”。

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大学英语三级A级

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