外语难题,谁告诉我为什么选C

The boys are finding out____ Ganny Li has put in the roomwhile the girs are finding out ____ Granny Li has put the novel in the room第一个填what,第二个填whether Granny Li has put 后缺少宾语 sth ,用what提问 表示放了什么东西。Granny Li has put the novel,the novel已经是宾语,说明find out后面接whether引导的状语从句。要发现是否将小说放进屋里。