--- I don’t know whether they did this or by design.
--- Who cares? They have to be punished.
A. by hand
B. by accident
C. by all means
D. by contrast
网友回答
A. by hand
(答案→)B. by accident
C. by all means
D. by contrast
解析：考查短语辨析。A用手；B偶然的；C尽一切办法；D相反。句意：——我不知道他们这样做是有意的还是偶然的。——谁知道呢？他们一定会受到惩罚。根据句意说明B正确。