Alan is a careful driver but he drives of my friends.A. more carefullyB. the most caref

问题补充：

Alan is a careful driver, but he drives of my friends.

A. more carefully

B. the most carefully

C. less carefully

D. the least carefully

答案：

A. more carefully

B. the most carefully

C. less carefully

(答案→)D. the least carefully

解析：形容词（副词）比较等级在特定语境中的用法。由题干中的but可知，后半句表否定意义，故选D项。the least+形容词（副词）+原形，表示“最不……”。