They were surprised when they heard the whisper.They were surprised ----- ----- the whisper.
题目
They were surprised when they heard the whisper.They were surprised ----- ----- the whisper.
答案
They were surprised when they heard the whisper.They were surprised when hearing- the whisper.
状语从句和非谓语之间的转换
主语they是主动听,所以后面动词用的是现在分词when hearing
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