Your mother , however, say that to us that day.A. doesB. didC. is doingD. was doing

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@@A. [email protected]@(答案)B. [email protected]@C. is [email protected]@D. was doing
解析： 根据句意及that day 可知谓语动词用一般过去时。其中的did为强调用法,表示“的确，确实”，后面必须接动词的原形，而且要用在肯定句中。