问题
选择题
--- Is it true that Mike refused an offer from Yale University yesterday?
--- Yeah, but I have no idea _______ he did it; that’s one of his favorite universities.
A．when
B．why
C．that
D．how
答案
答案：B
题目分析：Mike放弃了最心仪的耶鲁大学，令人不解其故。A项表“时间”，D项表“方式”，均不合题意。have no idea =" not" know，后面的从句应该表示“疑问”，排除表“确定事实”的C项。故本题选择B项。why表示“原因”。