1. An underlying assumption of most market research is that people are continually ____ financial decisions based on their desire for goods that give them the most satisfaction. (A) making (B) and make (C) being made (D) having made 2. ____ tempera...
否定句型: 1. There is not a moment to be lost. 分秒必争。 2. There is no holding back the wheel of history. 历史车轮不可阻挡。 3. Not a soul was anywhere visible. 到处见不到一个人。 4. I felt sorry for not coming in time....
could也能表示过去的一般的允许: On Sundays we could(=were allowed to)stay up late. 星期天晚上我们能到较晚才睡。 当某一具体行为获准并付诸实施时,就必须用was/were allowed代替could: I had a visa so I was allowed to cross the frontier...