The United States has reduced its forces there to around 8600 since signing the deal with the Taliban in February.这里的since signing...意思是自从签署了...那么为什么不用since having signed 完成时呢?
...le Ages knew as much about the Solar System as people do today.以下是我的分析,请老师指教1 如果把knew看作及物动词,那much应该是代词做宾语,about the Solar System修饰代词much?2 如果把knew看作不及物动词knew about the Solar System,那much应该是程...
曹老师,您好!在传统语法的框架下讨论虚拟语气:She looked as if she'd had some bad news.(虚拟语气)看来,她好像是听到了什么坏消息似的。将she'd had=she had had 改成 she had, 即:She looked as if she had some bad news这是不是不是虚拟...