He arrived in New York in 1949,_____ ,some years later,he became a writer.

问题描述:

He arrived in New York in 1949,_____ ,some years later,he became a writer.
A.when B.that
C.where D.which
为什么?请讲清楚,

可以把句子调整为:In 1949,He arrived in New York where he became a write some years later.