I ______ to the lecture that afternoon, but I ______ a bit ill.

A．should have gone; was

B．would have gone; had been

C．should go; was

D．would go; had been

胸腺依赖抗原诱发抗体反应必须由以下哪一组细胞参与

A．T淋巴细胞和B淋巴细胞

B．T淋巴细胞和巨噬细胞

C．T、B淋巴细胞和巨噬细胞

D．B淋巴细胞和巨噬细胞

E．T、B淋巴细胞和NK细胞