Question

2．在圣诞节那天，Tom的爸爸装扮成圣诞老人派送礼物．
On Christmas Day，Tom's fatherdressedupas Santa Claus and gave away gifts．

Answer 1

分析 dressed up．

解答 答案：dressed up．结合句意这里是说过去的事情用一般过去时，表示装扮用dress up，过去式dressed up，故答案是dressed up．

点评 dress in 
（使）穿…的服装
You should dress in a way that befits a woman of your position．
The bride may dress in red silk and may wear cardboard wings with feathers on her head．
dress up in 
穿上
They're all dress up in their robes and their bed sheets and act like a bunch of ghosts or spooks or something．
俩者都表示"穿"，dress up 更侧重与穿的动作和状态；dress in 强调服装的样式
dress up后加人，表示给谁穿衣服
例句：She is too young to dress up herself．