I don’t know ______ yesterday.

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问题 I don’t know ______ yesterday.

选项 A、why didn’t he go to school
B、why he didn’t go to school
C、when he didn’t go to school

答案B

解析 I don’t know+宾语从句，从句语序为陈述句语序，C项在语义上讲不通。

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