B
考查宾语从句。根据宾语从句的陈述语序，排除A、C，再根据宾语从句的时态规律，可见主句是一般现在时understand，从句中出现yesterday，则从句用一般过去时。
根据所给的汉语内容，用英语完成下列句子。（每空限一词）
I don’t understand ______ such a silly question in class yes
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相关问题
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------I don’t know why he has made such a silly mistake in t
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If I(be)__you,I wouldn't ask such a silly question.
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One silly question I simply can’t understand is "How do you
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Don`t talk about such things ______you don`t understand.
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How don't I understand am in
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( )Don"t stand up in class until you ___to.Do you understand
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maybe,ask,question frer,Don 't be silly,he won't promise you
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i don't understand
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i didn't understand 与 i don't understand的区别?
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it is ______(fool) of you to ask her such a silly question.