the problem is (how) we can( operate) the new machine( on) such (a) short time.
问题描述:
the problem is (how) we can( operate) the new machine( on) such (a) short time.
英语挑错,括弧中的,为什么?
答
on 变成in
固定词组in such a short time 在如此短的时间内