The reason _____ he was absent from class yesterday was that he was ill and hospitalized.

选择一项：

A.
for


B.
why


C.
that

译文：他昨天旷课是因为病了住进了医院。 解析：句型The reason why…is/was that…是一个常用句型，用来表达“某事的原因是……”。其中why引导的是定语从句，修饰先行词the reason；我们也常常见到the reason for…结构，但for是介词，后面需要跟名词。所以正确答案是B。 正确答案是：why