下列各组离子在指定溶液中一定能大量共存的是 ①透明溶液中:K+、Fe3+、MnO4-、SO42- ②pH=11的溶液中:CO32-、Na+、AlO2-、NO3- ③加入Al能放出H2的溶液中:Cl-、Br-、SO42-、NH4+ ④由水电离出的c(OH-)=10-13mol·L-1的溶液中:Na+、Ca2+、Cl-、Br- ⑤有较多Fe3+的溶液中: Na+、NH4+、Cl-、HCO3- ⑥酸性溶液中:Fe2+、Al3+、NO3-、Cl- A.①② B.③⑥ C.②④ D.③⑤You and I could hardly work together, _____?
A. could you B.
couldn’t I
C. couldn’t we D.
could we