题目内容

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