问题补充：
she is not so healthy she used to be?
A. Why is it that; what
B. Why it is that; that
C. Why is it that; as
D. Why it is that; who
答案：
A. Why is it that; what
B. Why it is that; that
(答案→)C. Why is it that; as
D. Why it is that; who
解析：主要测试强调句型辨析。在强调句型使用特殊译文结构时，应该遵循以下格式：特殊疑问词 + it + is / was + that 、、、；疑问结构就是：特殊疑问词 + is / was + it + that 、、、？故此选择：C。第二空：what 引导句子，而且充当句子：she used to be的表语。句子译文：究竟是为何他现在不和以前一样健康？
