说明
作时间状语
核心问题
____ the sound, many people came ____ to see what had happened. A. Heard, ran B. Hearing, running C. Hearing, to run D. Heard, running 答案为 B。但是，Hearing the sound 在句中作什么成分呢？
词典解答
上句中的现在分词短语 Hearing the sound 可分析为时间状语, 它相当于一个时间状语从句:
As(When) they heard the sound, many people ...
下面是类似的实例：
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Hearing the news, they all jumped with joy. (When they heard the news, they ...) 听了这个消息他们都高兴得跳了起来。
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Walking slowly across the grass he pointed the pipe at the lion and fired. 他慢慢地走过草地，把枪管对准狮子就射击了。
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Coming out of the theater we found that it was quite impossible to get a taxi-cab. 走出剧院(时), 我们发现想找一辆出租车是不可能了。