______ the building did he realize that there was danger everywhere in it.A、Upon

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问题 ______ the building did he realize that there was danger everywhere in it.

选项 A、Upon entering
B、When he entered
C、Only after entering
D、After he had entered

答案 C

解析

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______thebuildingdidherealizethattherewasdangereverywhereinit.A、Upon