----behind the door,she wanted to give him a surprise.

____behind the door,she wanted to give him a surprise。A hiding B hidden C to hide 你不说我也选错了,经你一提醒我好象记得有这回事:有些动词在做状语的时候,要用过去分词形式,例如compare,dress,engage,absorbe等等,有好多好多,都是平时要积累的。Compared with you,I love this song that much。Dressed in diving suits,Captain Nemo and his guests walk around in this magic world,lighted by the lamps of the ship。(Jules Verne's 20000 Leagues Under the Sea。)这类词大概都是表示一个状态或者是由于be+V。-ed的缘故,做状语时be省略,便有了过去分词的形式。那么这个题选B的原因应该是表示状态吧。我是个高中生,刚才选错了很不好意思,也谢谢你的提醒,我也会加强学习的。