第13题: [单项选择]______, he felt too nervous to speak. A. Having been watched by a crowd of people B. Watching by a crowd of people C. Having watched by a crowd of people D. Being watched by a crowd of people 参考答案:D 答案解析:本题为语法结构题,考分词结构。他是被别人看,而不是看别人,因此,要用被动语态。另外,现在分词表示主动,用作伴随状语,说明一动作发生时另一动作也同时发生。而 Having been watched by