问题
选择题
I didn't know _____ yesterday.[ ]
A. why isn't Danny in school
B. why wasn't Danny in school
C. why Danny isn't in school
D. why Danny wasn't in school
答案
答案：D
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I didn't know _____ yesterday.[ ]
A. why isn't Danny in school
B. why wasn't Danny in school
C. why Danny isn't in school
D. why Danny wasn't in school
答案：D