（）he had a reputation for being a careful driver, his accident c

（）he had a reputation for being a careful driver, his accident came as quite a surprise.

If

 Although

 Since

For

本题考查的是原因状语从句的使用。

since放在句首表示“因为”，A选项“如果”，B选项“虽然”，D选项“for作因为使用时不能置于句首”。

句意：因为他有着开车小心的好名声，所以他出事故这件事让大家很惊讶。