葡萄树什么时冻剪好:englishi

来源:百度文库 编辑:中科新闻网 时间:2024/05/09 07:41:43
1.到底是BE SURE OF STH.还是BE SURE ABOUT STH.?

应该是be sure of

Arriving on foot, he could be sure of taking his men unawares.
步行到达,他确信会使手下的人大吃一惊。