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题型:单选题 题类:常考题 难易度:普通

鲁教版(五四制)八年级上册Unit 4 An old man tried to move the mountains. Period 2 Section A (3a-4c)同步练习

The boy stood there in silence. This is ____________ he realized he made a serious mistake.
A、why B、because C、what D、how
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