anything like this style of architecture before, we thought we were looking at giant scul

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A. We had never seen
(答案→)B. Never having seen
C. Never being seen
D. Never had we seen
解析：考查分词做状语。因为句子没有连词，所以只能选非谓语动词；动词see与句子主语we之间构成主动关系，且动词see发生在think之前，所以选使用现在分词的完成式。句意：因为之前没有看见过这样的风格的建筑，我们还以为我们看到的是巨大的塑像，而不是建筑物。故B正确。