Was it in the train “ Harmony”, is China’s first high-speed one, that John met with his f

Was it in the train “ Harmony”, is China’s first high-speed one, that John met with his foreign friend？
A. which
B. that
C. what
D. where

(答案→)A. whichB. thatC. whatD. where解析：本题考查定语从句。先行词为the train “ Harmony”在定语从句中作主语，由于是非限定性定语从句，故只能用which。

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