题目

I __________ to send Peter a gift to congratulate him on his marriage, but I couldn't manage it. A . had hoped B . am hoping C . have hoped D . would hope 答案：A下列电离方程式书写正确的是（   ）  A. NaHSO4 =Na＋＋HSO4－         B. H2SO32H＋＋SO32－  C.Fe(OH)3Fe3+ ＋3OH－        D. CaCO3  Ca2+＋CO32－