He hasn't come back ___ he left home three years ago.A.for B.at C.since D.about

Question

He hasn't come back ___ he left home three years ago.A.for B.at C.since D.about 请讲明选择理由

Answer 1

C
现在完成时的基本结构　 has +done + since+过去的一个时间点

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