Could have been who helped Suny get her work done?Could have been who helped Suny get her work done?A they...it B they...them C it...them D it...they选什么？为什么？
问题描述：
Could have been who helped Suny get her work done?
Could have been who helped Suny get her work done?
A they...it B they...them C it...them D it...they
选什么？为什么？
答
陈述句 it could have been them who...
疑问句 could 提前，表对过去的推测，可能是他们帮sunny搞定了事情么？
答
会是他们帮助萨尼把她的工作做完的吗？ It could have been them who helped Suny get her work
C 对
答
c 因为这里的it 是形式主语代替后面的真正主语they
还原成陈述句it could have been them who helped suny get her work done.
答
c
很难解释啊