单选题
The reason ______ I can't come is that I am having a headache.
A) because
B) why
C) as
D) for
A
B
C
D
【正确答案】
B
【答案解析】
[解析] 先行词reason后跟why引导的表原因的限定性定语从句，这类从句多由关系代词或关系副词引导，例如：There are the reasons why we do it.(这些就是我们这样做的理由。)
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