it was ten years _Miss lin returned to jinanA that B before C when D since

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it was ten years _Miss lin returned to jinanA that B before C when D since

it was ten years _Miss lin returned to jinanA that B before C when D since
it was ten years _Miss lin returned to jinan
A that B before C when D since

it was ten years _Miss lin returned to jinanA that B before C when D since
B before
since前用完成时,即it has been ten years

D

选B,主句过去式,从去过去时,主句一般是主语加一段时间。 这是before的用法,since 主从句时态不一致,如果选since,这个句子应是it is ten years since Miss linreturned to jinan.

D,如果是it has been ten years since,可以写成是it is ten years since。好孩子都是认真听老师讲课的,那两位选B的。我向你保证,是D。