...概念三有一句话, Where had it come from ? (不一定是刚刚过来的) 那我能否使用 I have come from china . (为什么?)(2) 见过完成进行时和have been adj,这种结构没有加时间限定, 但是怎么知道他们表达的时间范围呢? ...
"The only thing she's mentioned is a ballerina dress. It's priced at $ 125. She's been invited to some parties by her friends at school."she's mentioned 是完成时吧?