骨髓移植后，引起GVHR的主要效应细胞是骨髓中的（）
A.骨髓基质细胞
B.浆细胞
C.T细胞
D.巨核细胞
E.中性粒细胞
参考答案：C
___Mr Chen is waiting outside to speak to you. He appears to be quite ___ important person.
A．/. an
B．A, an
C．The, the
D．The, /
