刘乐古筝演奏里有什么:if you happen______

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补充完整成一个句子
该完整句中的happen =what had taken place

to meet him, what will you do?
如果你碰巧遇见他,你会怎么办?

if you happen to know Mr John's address
英语九00句里有类似的句子.

if you happen______ If you are you like If you love someone If you love something, if you go away if you 的歌词！ if you were here if i were you If you think you can,you can If you think you can , you can .