in a white uniform, he looks more like a cook than a doctor.
A. Dressed
B. To dress
C. Dressing
D. Having dressed
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(答案→)A. Dressed
B. To dress
C. Dressing
D. Having dressed
解析：考察固定词组。Be dressed in穿着….dressed in对he的情况进行说明。句意：穿着白色的制服，他看上去更像厨师而不是医生。