It was getting dark but the little boy didn’t know.A. who can he ask for helpB. what was

问题补充：

It was getting dark, but the little boy didn’t know.

A. who can he ask for help

B. what was wrong with the bike

C. where can he go to mend the bike

D. if he could arrive home on time or not

答案：

A. who can he ask for help

(答案→)B. what was wrong with the bike

C. where can he go to mend the bike

D. if he could arrive home on time or not

解析：句意：天变黑了，但是这个小男孩不知道自行车出什么毛病了。宾语从句中要用陈述语序，A和C为疑问语序，可排除；D项中的if多与or not连用，表达是否；故选B。