请选择DCBA9_(f6n/R)[8J:~7p/q Ben and I ________ some flowers last week..V7u7W5m.D;e9K'F1l*B
A．plant.V7u7W5m.D;e9K'F1l*B
B．planted.V7u7W5m.D;e9K'F1l*B
C．planting.V7u7W5m.D;e9K'F1l*B
D．plants.V7u7W5m.D;e9K'F1l*B