CREATE TABLE table_17520 ("Year" FLOAT, "Mens singles" TEXT, "Womens singles" TEXT, "Mens doubles" TEXT, "Womens doubles" TEXT, "Mixed doubles" TEXT)

Who was the womens doubles when the mixed doubles is jacco arends selena piek?
SELECT "Womens doubles" FROM table_17520 WHERE "Mixed doubles" = 'Jacco Arends Selena Piek'
SELECT "Womens doubles" FROM "table_17520" WHERE "Mixed doubles" = 'Jacco Arends Selena Piek'