问题描述：
_ by a large audience ,he felt very nervous and didn't know what to say a watching b watch c watch
_ by a large audience ,he felt very nervous and didn't know what to say
a watching b watch c watched d having watched
_ by a large audience ,he felt very nervous and didn't know what to say
a watching b watch c watched d having watched
问题解答：
我来补答展开全文阅读