-Why did you talk to the teacher after class?-I don't understand ________ during the lecture．A.the problem did she tell usB.how did she sayC.that she was talking aboutD.what she was teaching
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D解析宾语从句应用陈述语序。C项虽为陈述语序，但介词about缺少宾语，应用what引导而不用that，故选D项。