成熟B细胞的膜表面免疫球蛋白主要有
A.mlgM和mlgE
B.mlgD和mlgG
C.mlgD和mlgE
D.mlgM和mlgD
E.mlgM和mlgG
参考答案:D
“The moment ________ soon”,he thought to himself,waiting nervously.(2012·湖南)
A.came
B.has come
C.was coming
D.is coming