单选题
______ the building did he realize that there was danger everywhere in it.
A、
Upon entering
B、
When he entered
C、
Only after entering
D、
After he had entered
【正确答案】
C
【答案解析】
[解析] 句意：只在进入大楼后，他才意识到危机四伏。从句子结构上看，本句为倒装句，只有only可以引导倒装句。
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