We all like the photographs by our teachers.A. were takenB. takenC. takingD. to take

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A. were taken
(答案→)B. taken
C. taking
D. to take
解析：考查过去分词做定语：句意：我们都喜欢老师拍的照片。这里需要定语修饰photograph，因为photograph和take是被动关系，用过去分词做定语，选B。