问题
选择题
I don’t know the reason _________ he’s come so late.
A．/
B．for which
C．why
D．all the above
答案
答案：D
reason后面定语从句的引导词是why，that，for which或不用引导词。
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I don’t know the reason _________ he’s come so late.
A．/
B．for which
C．why
D．all the above
答案：D
reason后面定语从句的引导词是why，that，for which或不用引导词。