问题
选择题
The old lady was so pleased with all ______ we had done for her ______ she wrote us a thank-you letter.
A．what; that
B．that; that
C．which; that
D．that; what
答案
答案：B
考查定语从句。先行词是all much 等代词时，引导词必须用that；当前面已有其它引导词时，后面引导词只能使用that。根据先行词all可知前面用that，故选B。