单选题 It was because of his carelessness ______ the car accident took place.
A. that B. because C. why D. which

【正确答案】 A
【答案解析】本题考查的是强调句，是对because of his carelessness这一介词短语，即对原因状语的强调。It is…that是强调句的基本结构，故选A。其他选项都不引导强调句。