单选题
[2005.10]You can never know ____ he is really aimed at.
A.what
B.how
C.why
D.who
正确答案：A
答案解析：本题考查复合句。be aimed at目标是，目的是。从语法结构来分析，what是at的宾语，what he is really aimed at 作know的宾语。