David and Jack, so much alike each other, were often considered twin brothers.
A. looking; to be
B. looking; being
C. looked; to be
D. being looked; being
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(答案→)A. looking; to be
B. looking; being
C. looked; to be
D. being looked; being
解析：考查固定搭配。be considered to do sth.“被认为......”，排除B、D；David and Jack和look之间是主谓关系，应该用现在分词。故选A。