they received a message from a spacecraft.(用just改成现在完成时态)

a mess 英语:they are a mess这句话对不对?这里的They 指books 在语法书上看到的：What a mess they are! make a mess in a mess I'm a mess A BEAUTIFUL MESS怎么样 （ ）special training ,they succeed in climing to the top of the mountain.A received B being received C to received D having received选啥? make a mess,in mess,in a mess,in the mess区别 received a They should respect the common space that we share and make sure that they are not making a mess. mess mess in a mess 和a mess有什么区别 make a mess 的音标 make a mess 中文意思 make a mess的意思 What a mess!怎么翻译? Do not make a mess!