Never let your mind wander when driving a car crash is probable.A. butB. soC. becauseD.

问题补充：

Never let your mind wander when driving, a car crash is probable.

A. but

B. so

C. because

D. or

答案：

A. but

B. so

C. because

D. or

解析：

句意为“开车时千万不要走神，否则可能会发生撞车事故。”；D项“否则，要不然的话”符合句意。