You can’t know()when the pupils received these nice presents

You can't know()when the pupils received these nice presents on children's Day?A.how they were
excited B.how excited they were C.how excited were they D.they were how excited为什么

1.B.how excited they were 从句中的感叹句!
2.全句意思；你不知道当那些小学生在儿童节收到那些漂亮的礼物时是多么高兴!
3.感叹句的基本结构
两种：
What +a +(形容词）+（名词）+其余陈述部分!
What +形容词+名词+其余陈述部分!
How+（形容词） /（副词）+其余陈述部分!
4.注意,是陈述句!

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