30.________ by a crowd of people, I felt nervous, ______ what to say.
问题描述：
30.________ by a crowd of people, I felt nervous, ______ what to say.
A．Watching, didn't know
B．Having watched, and not knew
C．Having been watch, not known
D．Being watched, not knowing
答案为D. 请问为什么不能用A
答
首先,句子的意思是：由于被一群人看着,我感到很紧张,不知道说什么.所以,第一空是表示的是被动,要用Being watched；第二空如果要用didn't know 的话,应该在前面加and,作为逗号后面的动词与前面的连接.D中用的not know...