1.(2016·江苏高考,26)________ some people are motivated by a need for success,others are motivated by a fear of failure.
A.Because B.If
C.Unless D.While
D [考查语意逻辑关系。句意:尽管(while)有人被成功的需求所激励,但也有人被失败的恐惧所激发。D项while意为“尽管”,引导让步状语从句,符合语境。because表原因;if表条件;unless表条件。]