填空:Paul and Peter ____(not finish)their homework before 9 o'clock.
问题描述:
填空:Paul and Peter ____(not finish)their homework before 9 o'clock.
用haven't finished 为什么
答
Paul and Peter __haven't finished __(not finish)their homework before 9 o'clock.保罗和彼特在9点之前还没有完成他们的作业.用haven't finished 也可以,只是意思不同,我现在觉得haven't finished 似乎更好....