甲、乙两种抗原都能与某一抗体发生特异性结合反应，这两种抗原相互称为（）

A.半抗原

B.完全抗原

C.TD—Ag

D.TI—Ag

E.共同抗原

After the final exam, Changchang,  ______  her mother, is going to travel to Canada instead

of staying at home all the time.    [ ]

A. and                        

B. with                  

C. as well