不参与抗体产生的细胞系是（）。
A.粒细胞系
B.单核吞噬细胞系
C.T细胞系
D.B细胞系
E.红细胞系
参考答案：A, E
No sooner ____ to the cinema ____ the film began. [ ]
A. had he got, than
B. he had got, when
C. did he get, than
D. had he got, when
3，5，21，73，261，( )
A．522 B．929 C．984 D．783
