---Anna, you look so tired and wet all over!

---Well, you know, all morning I _______ my books to my new office on the third floor.

A．am moving

B．have moved

C．had moved

D．have been moving

把带锈的铁钉放入稀盐酸中，现象是______，反应的化学方程式是______；若浸泡时间较长，还会看到铁钉表面有______，该反应的化学方程式是______．