The clever boy made a hole in the wall(through which)he could see(what)was going on inside the hous为什么不是用through that ,what,

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The clever boy made a hole in the wall(through which)he could see(what)was going on inside the hous
为什么不是用through that ,what,

wall 后是一个定语从句,而引导定语从句只能用介词+which,不能用that,
what不能引导定语从句