Was it through Mary was working at a high school you got to know Tom?A. who; whoB. th

问题补充：

Was it through Mary, was working at a high school, you got to know Tom?

A. who; who

B. that; which

C. who; that

D. who; which

答案：

A. who; who

B. that; which

(答案→)C. who; that

D. who; which

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