问题补充：
Do you know the reason he was late?
A. that
B. which
C. where
D. why
答案：
A. that
B. which
C. where
(答案→)D. why
解析：考查定语从句。the reason是先行词，代入定从 he was late，应是he was late for the reason，先行词在定从中作原因状语，所以选D。
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时间：2018-08-31 06:56:11
Do you know the reason he was late?
A. that
B. which
C. where
D. why
A. that
B. which
C. where
(答案→)D. why
解析：考查定语从句。the reason是先行词，代入定从 he was late，应是he was late for the reason，先行词在定从中作原因状语，所以选D。
