Question

为什么选d不选c

They travel at full speed by day ____ . A. and night B. and by night as well as C. as well at night

D. as well as by night

Answer 1

只有as well as
没有aswell at

追问

不好意思，c选项是as well as night 我打错啦 你再看看

追答

前面是by day 后面就by night 如果是at night就不匹配了。