交叉配血试验中“次侧”配血应加入（　　）。

A.受血者红细胞与供血者红细胞

B.受血者血清与供血者红细胞

C.受血者血清与供血者血清

D.受血者红细胞与供血者血清

E.供血者血清与供血者红细胞