The reason he gave for being late was he overslept this morning．A. why; thatB. why; beca

问题补充：

The reason he gave for being late was he overslept this morning．

A. why; that

B. why; because

C. which; that

D. which; because

答案：

A. why; that

B. why; because

(答案→)C. which; that

D. which; because

解析：第一空为定语从句，从句中缺宾语；第二个空为表语从句，从句中不缺成分。