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A. teaches , do3];t2Y0N,o7q1C9P0g1f8o-B-G;S
B. taught , to3];t2Y0N,o7q1C9P0g1f8o-B-G;S
C. taught , in3];t2Y0N,o7q1C9P0g1f8o-B-G;S
D. teach , on3];t2Y0N,o7q1C9P0g1f8o-B-G;S