She was just about to explain ___ she hadn't passed her maths test chiefly out of carelessness ___ her uncle came.A.her mother … whenB.to her mother why … thatC.her mother that … whenD.to her mother that … when
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D解析explain/ announce等后面的结构是～ sth. to sb.或～ to sb. sth.，to 不可省略。