A:have taken place
B:were taken place
C:have been taken place
D:took place
①旋岚偃岳而常静,江河竞注而不流 ②坐地日行八万里,巡天遥看一千河
③野马飘鼓而不动,日月历天而不周 ④两岸青山相对出,孤帆一片日边来
下列溶液中各组离子一定能够大量共存的是