SC question: From Princeton

lilya

At the time of the Civil War, most of the weaponry used in fighting [U]was little different than that in wide use during the previous 100 years.[/U]
C.differed little from that which had been widely used during
D.......................................................in
答案是C。可LZM的书上说during 很少用于完成时态，一般用in。哪位能确认一下？多谢了！

atongmu

倒！during 一般都是用完成事态的。