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。 smoking D. smoking。 smoking 二、 把下列句子改為被動(dòng)語(yǔ)態(tài)。 1. We should help Mary with swimming. Mary _______ _______ _______ with swimming by us. 2. His hair is too long. He should have it cut. His hair is too long. It _______ _______ _______. 3. My mother asked me to do the homework at once. I _______ _______ _______ do the homework at once by my mo