历年英语四级考试真题高频词汇短语
历年英语四级考试真题高频词汇
历年英语四级考试真题高频词汇
1、介词+名词
by accident 偶然 on account of 由于 in addition to in the air 流传中
on(the/an) average 平均,通常 on the basis of 以…为基础
at best 至多 for the better 好转,向好的方向发展
on board on business out of breath