was Sam aware that he was in danger.

admin2010-06-03  32

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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