问题补充：
The reason he was late for work was he didn’t get up early.
A. for, because
B. which, because
C. why, that
D. for, that
答案：
A. for, because
B. which, because
(答案→)C. why, that
D. for, that
解析：考察定语从句和表语从句。本题第一空why引导的是定语从句，对前面的先行词the reason进行修饰。Why在句中做状语。第二空that引导的是表语从句，只是一个引导词，不在句中充当任何成分。句意：他上班迟到的原因是他起床晚了。故C正确。
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