His grandparents used to ________ a walk after dinner, but now they are used to ________ a walk after breakfast.A.take, takeB.taking, takingC.taking, takeD.take, taking
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D解析考察固定搭配，used to do sth 过去常常做某事 be used to doing sth 习惯于做某事，句意：他的祖父母过去常常晚饭后去散步，但是现在他们习惯早饭后散步。故选D