2. 外语
  3. ______ the building did he realize that there was danger everywhere in it.

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

admin2010-02-22  28
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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