题目

__________ your help, I passed the examination without any difficulty. A . Because of B . Owing to C . Due to D . Thanks to 答案：D一氯代物的同分异构体有2种，二氯代物的同分异构体有4种的烷烃是   A．乙烷        B．丙烷  　　  C．正丁烷    　　 D．新戊烷