the poor man had nothing todo but got down on his k------to pray 填什么,怎么翻译 悬赏分:0 | 离问

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the poor man had nothing todo but got down on his k------to pray 填什么,怎么翻译 悬赏分:0 | 离问
这里有一个not but 词组吗

填knee.
固定搭配go down on one's knee,意思是“跪下”