—We were surprised to hear that the reason she gave for her absence was her mother was ill

问题补充：

—We were surprised to hear that the reason she gave for her absence was her mother was ill.

—Yes，we saw her mother was at the supermarket that morning.

A. why；that

B. which；that

C. that；because

D. why；because

答案：

A. why；that

(答案→)B. which；that

C. that；because

D. why；because

解析：句意：我们很惊讶的听说她为缺席给出的理由是她妈妈病了。--是的，我们看见她妈妈那天早上在超市的。第一空是定语从句的关系词，先行词是the reason，定语从句中介词for后面缺少宾语，所以用关系代词that或which，不能用why，第二空是连接表语从句的连接词，主语是the reason的时候，表语从句用that连接，所以选B。