The airport was built during the war,but for some reason it could_英语解答

The airport was built during the war,but for some reason it could not be used then.
后面是不是then,为加它,不加行不行?

人气：286 ℃　时间：2020-06-03 02:12:51

解答

句意为.机场在战时修建,但由于某种原因那时并未启用.then 此处为那时加它表示时间,与could呼应.但不影响句意.可有可无吧.