On May 11th, the WHO officer Dr. Gauden Galea wrote a letter to Chinese students he called on young people to help people in need.A.who B.which C.where 题目和参考答案——青夏教育精英家教网—

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On May 11th, the WHO officer Dr. Gauden Galea wrote a letter to Chinese students ________ he called on young people to help people in need.

A.who B.which C.where

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