题目

Although the lecture had already been on for five minutes,I still was not able to find a chair_______.
横线处为什么不能填for sitting

提问时间：2020-10-09

答案

首先,sit后要用介词down,这里down不能省略.其次,一般用动词不定式的场合,不能用for doing代替to do.所以这里用 to sit down更好.