Mary told me not to worry because the (operate) ______ on Mr. Smith was very suc

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问题 Mary told me not to worry because the (operate) ______ on Mr. Smith was very successful.

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答案 operation

解析根据句子结构可以看出空格中需要一个名词作原因状语从句中的主语成分，operate的名词为operation，意为“手术”，后面通常跟介词on。

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