Mr. Sawyer started his career at Stanford University, _____ he became Professor

题干

Mr. Sawyer started his career at Stanford University, _____ he became Professor of Physics in 2002.

A．which	B．where
C．when	D．that

上一题下一题 0.64难度单项选择更新时间:2016-09-14 06:17:02

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