计算机不能直接执行符号化的程序，而是通过汇编程序、______ 和编译程序而将符号程序转换为可执行程序的。

－I really hope to get in touch with Tony.

－Sorry, I don't know ________. [ ]

A. why he loves China

B. how he returned to Canada

C. what his phone number is

D. where be studied Chinese