他的弟弟，好几年没见了，下周要来探望他。
His younger brother, who he hasn't seen for years, will come to visit next week.
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who英 /huː/|美 /hu/
解释
非限定性定语从句，who 作 seen 的宾语，he hasn't seen who。从句去掉后主句'他的弟弟下周要来探望他'完整且自然。
His younger brother, who he hasn't seen for years, will come to visit next week.
非限定性定语从句，who 作 seen 的宾语，he hasn't seen who。从句去掉后主句'他的弟弟下周要来探望他'完整且自然。