回5F,
如果這題要用選項(D)的話,
句子就必須變成如下普通的直述句:
After he had entered the store, he realized that there was danger.
不過因為題目已經提示在主要子句的主詞he之前有一個助動詞did,
所以這題只能選(C)的倒裝句句型了。
____________________ did he realize that..-阿摩線上測驗