．We are taught that a business letter should be written in a formal style in a personal one．
A. less than
B. other than
C. better than
D. rather than
网友回答
A. less than
B. other than
C. better than
(答案→)D. rather than
解析：短语辨析。A．小于B．除了；不同于 C．超过；好于……D．而不是。句意：已经教给你了商业信函应该用正式的格式书写而不是以私人风格，故选D。