【高中英语,求分析】1.Unless______ to speak,you should remain silent at the conference.

问题描述:

【高中英语,求分析】1.Unless______ to speak,you should remain silent at the conference.
A,invited B.inviting C.being invited D.having invited
我想选A,但好像C也没什么不对
直接用非谓语不行吗

A,invited
这是个条件句.
除非你被邀请发言,否则你应该在会议中保持沉默.
强调的是一个是否的结果.
而不是being这个动作.
问题补充:
直接用非谓语不行吗
如果直接用非谓语,就不是条件句了,要用Being not invited.