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

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

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

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

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