单选题
The reason ______ he gave for being late was ______ he overslept this morning.
A. why; that B. why; because
C. which; that D. which; because
【正确答案】
C
【答案解析】[解析] 第一个空要填入一个定语从句的引导词，先行词是The reason，在从句中作宾语，即he gave the reason for being late, the reason was...，所以用which引导，排除A项和B项。第二个空是表语从句，用关系代词that引导。