【题目】 The reason _________ the little actress has been such a success is ________ she is both clever and hardworking.
A. why; that
B. why; why
C. that; because
D. for; because
在线课程【答案】A
【解析】
试题分析：考查同位语从句和表语从句。句意：那个小女演员如此成功的原因就是她不仅聪明而且勤奋。固定结构the reason why…is that… “…的原因是…。故A正确。