Qian Xuesen passed away on October 31, 2009 ________ the age of 98, but he is a man ________ still encourages Chinese y

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1. Qian Xuesen passed away on October 31, 2009 ________ the age of 98, but he is a man ________ still encourages Chinese youth.

A . at; who B . on; who C . on; which D . at; which

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