问题补充：
The reason he didn come was he was ill.
A. why; that
B. that;why
C. for that;that
D. for which;what
答案：
(答案→)A. why; that
B. that;why
C. for that;that
D. for which;what
解析：. The reason why… was that….已成为一种固定句型，这一句中的why和that不能随意换位，也不能将that改成because，尽管that这个词在译文中可能有“因为”的含义。
