was Sam aware that he was in danger.A、When he entered the forestB、After he had

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问题 was Sam aware that he was in danger.

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

答案 C

解析 only后加副词、介词短语或状语从句置于句首时,句子要用倒装形式,即助动词、情态动词或系动词要放到主语的前面。例如:Only then could he realize his mistake.(只有在那时他才意识到自己的错误。)。/Only in this way can he succeed.(只有用这种方式他才会成功。)
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