帮我解决下初二英语题 求大神围观They didn't understand they didn't know .他们不
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题目内容：
帮我解决下初二英语题 求大神围观
They didn't understand ____ they didn't know ____ ____ ____.
他们不懂因为他们不知道整个经过.
Mary c____ come here today because she is sick. 根据首字母填空.
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