Terribly sorry, I came home at last. I of the supermarket so crowded.
A. should have thought; being
B. should think; being
C. could have thought; was
D. could think; was
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(答案→)A. should have thought; being
B. should think; being
C. could have thought; was
D. could think; was
解析：think of的宾语应为动词，排除C、D两项；由一个句子可知，事情发生过去，后悔自己不该去超市，因为人太多，故应选择should have done 结构，表示对过去事情的虚拟。