the clock structk twelve. I got home with my brother.A. AsB. WhileC. WhenD. Since

问题补充：

the clock structk twelve. I got home with my brother.

A. As

B. While

C. When

D. Since

答案：

A. As

B. While

(答案→)C. When

D. Since

解析：when,while,as解作“正当..”时,同义;他们区别主要在: when表示突然发生某事,常译为 “正在…(之时)突然…”; while表示对比,常译作 “而”; as表示时间,作 “随着…”解(不能用另二个替换。)