...here is a kind of false precision being hawked by people claiming they are doing ancestry testing," says Trey Duster, a New York University sociologist.请问老师,上述句子中为什么要用being hawked做precision的定语?不能直接用hawked吗,这已经表示被动了呀,为什么...
...再延续重复,就要用一般过去时态。请比较:19 1) Have you ever fallen off a horse?2) Did you ever fall off a horse?妙语点睛在例句1)中,用了现在完成时态,意味着“骑马”这个活动没有结束,将来还要骑马,因此fall off a horse这个事件可...