She stopped to ask me how she could be of service,? I raised my head and looked at her in the face.A.then B. at when C.at which time D.at which顺便说一下原因~~~~~~~~

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She stopped to ask me how she could be of service,? I raised my head and looked at her in the face.
A.then B. at when C.at which time D.at which
顺便说一下原因~~~~~~~~

楼主,我认为选A.
这是两个句子,中间有逗号,then其实可以做表示时间顺序的连词
至于at which等,是想让你选他们做非限定性定语从句,但不是这样,后一句话不缺介词at,look at her.故不对
以上为一己之见,不对之处,还望批评指正

D

C