问题描述：
英语语法时态 I thought you must have known that I ____ (be) happy when you ____ (say) "con...
英语语法时态 I thought you must have known that I ____ (be) happy when you ____ (say) "congratulations" to me!
英语语法时态 I thought you must have known that I ____ (be) happy when you ____ (say) "congratulations" to me!
问题解答：
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