题目

—I’m sorry to hear that your pet dog has died.    —Though my dog             for three months, I still miss him.   A. has died   B. has been dead              C. died    D. was dead 答案：B下列溶液中的各组离子，通入过量SO2气体后仍能大量存在的是A．Ba2+、Ca2+、Cl－B．OH－、CO32－、Na+C．Ca2+、ClO－、Cl－D．H+、Fe3+、NO3－