问
Three hours ought to be enough time, ____? A. oughtn't three hours B. didn't they C. shouldn't it D. shouldn't three hours 答案为 C。这是我所不能理解的:反意问句中为什么用 shouldn't it,而不用 oughtn't it。
答
这里也可以用 oughtn't it? 见 oughtn't。
Three hours ought to be enough time, ____? A. oughtn't three hours B. didn't they C. shouldn't it D. shouldn't three hours 答案为 C。这是我所不能理解的:反意问句中为什么用 shouldn't it,而不用 oughtn't it。
这里也可以用 oughtn't it? 见 oughtn't。