问题补充：
He was so pleased with all we had done for him he wrote us a letter to praise us for it.
A. that; that
B. what; that
C. that; what
D. what; what
答案：
(答案→)A. that; that
B. what; that
C. that; what
D. what; what
解析：考查定语从句及状语从句。第一个that引导定语从句，在从句中作宾语，第二个that为so … that …引导的状语从句。故选A。
