题目：
Addressing modes constitute a very important topic when people discuss alterna
tive designs of CPUs. Common addressing modes include register, immediate, dir
ect, and PC-relative mode, etc. Find a wrong statement from the following choi
ces.
(A)
Every CPU supports the direct addressing mode.
(B)
In practice, having immediate, direct, register, and indexed mode is enough fo
r almost all applications.
(C)
Compilers are in charge of finding the best addressing modes for statements wr
itten in high-level languages.
(D)
When offering a limited number of addressing modes, the architecture must make
sure that common applications will be computable.
(E)
none of the above.
答案是给A，我不是很明白为什么，有办法举出反例之类的吗，比如哪一种架构的电脑不
使用直接寻址(只使用其他的寻址方式)？
B选项的indexed mode也不是很懂...