高二英语选择:We could have asked someone to carry

问题描述:

高二英语选择:We could have asked someone to carry
We could have asked someone to carry out the plan privatelywithout it _____.
A was known B.knowsC.being knownD.be known
请详细说说.

C AB选项里都有动词 句子里不可能两个动词 without介词后面跟 ing形式为什么不是过去式呢?without doing 是固定搭配