您好：
how Harry managed to keep a straight face during these performances is quite beyond me中
how Harry managed to keep a straight face during these performances：
这是一个主语从句，作整个复合句的主语。
how在主语从句作的是状语，表示方式。
beyond me：为我所不能理解。
是的 引导主语从句
how harry managed to keep a straight face during these performances整个句子做主语
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