【11. I want to give a birthday party but I am 】

问题补充：

11. I want to give a birthday party, but I am not sure

答案：

我想举办一个生日派队,但是我不确定该邀请谁

C语法错误,应该改为whether to invite the girls

B的错误很明显,宾语从句当然要把WHOM移到动词SURE后面来