题目

He was so pleased with all ________ we had done for him ________ he wrote us a letter to praise us for it. A．what; what                           B．what; that C．that; what                           D．that; that 答案：解析：all作先行词时用that引导定语从句，what不可以引导定语从句。 what相当于一个名词加that。第二个空的that与so构成句式：so ... that ... “如此……以至于……”。 答案：D

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