LOOK!He_dress up in __a monkey costum .He will dress up as___Monkey King.
dress up in v.打扮,装饰；穿上盛装（衣服）
dress up as 打扮得象.一样A、dresses up in,dress up asB、is dressing up in,dress up asC、is dressing up as,dress up inD、dress up in,dresses up in专家回答一下答案选B不好意思，之前看错了look，这个动作可以判断出句子要用一般现在进行时