They'vekeptupafr

发布时间：2020-07-25 13:17:51

They've kept up a friendship with the teacher whom they were at school _____ twenty years ago.A.withB.aboutC.sinceD.till

网友回答

A解析易错选B或C, whom在这里指代the teacher,因此定语从句可还原为： They were at school／with the teacher twenty years ago.
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