待讨论的句子:But even though he had won everything it was possible to win in his sport, Li Ning retired with the feeling
that he had failed.来源: 外研社高中必修五课文问题:加粗部分有个it，it前应该省略了一个关系词that，it此时作为形式主语，即指to win ev...
请问下面的内容摘自一本原版语法书，我对其中的 the property in question 不理解：1. The
“semi-auxiliaries,” including be going to, ought to, have to, and used to, are
not prototypical in that they do not have all of these properties. 2. Expressions in
which the verb phrase...