问题补充:
The reason he hasn’t come is .
A. that; because he is ill
B. that; because of his illness
C. why; for he is ill
D. why; that he is ill
答案:
A. that; because he is ill
B. that; because of his illness
C. why; for he is ill
(答案→)D. why; that he is ill
解析: he hasn’t come是定语从句,先行词The reason在定从中作原因状语,用why引导;is后是表语从句,不能用for引导,所以选D。