This kind of mobile phone(sells)well.解释一下为什么添sells

This kind of skirts sells very well.为什么不是This kind os skirts This kind of shirt looks well and sells well. sells,kind,this of,well,shirt 连词成句 The books of this kind sell well.那么This kind of books sells This kind of skirt looks------and sells----- This kind of shirts looks and sells This kind of apple tasts () and sells () books of this kind_____very well.(sell/sells) This kind of shoes __________ (sell) well.用sell还是sells? This kind of skirt looks()and sells()A:nica,well B:nice,good cellphones of this kind [ ]well [a] sell [b]sells [c] are so this kind of books sells well and are sold out in the booksh