Hard work is regarded as the key to (make) ______ progress.making本题考查的是词性的转换。句中的

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

选项

答案 making

解析本题考查的是词性的转换。句中的to为介词，故后面必须跟名词或动名词。

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He’swatchingTV?He’s______tobecleaninghisroom.A、supposedB、regardedC、kn