[单项选择]The witness claimed ______ a man in the party, but he was not sure whether this was the man. A. to see B. to have seen C. that he saw D. that he has seen
第32题: [单项选择]浆细胞瘤对体液免疫抑制作用机制为 A. IL-4合成增加,B细胞活化抑制,APC抗原呈递抑制 B. IL-4合成减少,B细胞活化抑制,APC抗原呈递抑制 C. IL-4合成增加,B细胞活化增强,APC抗原呈递抑制 D. IL-4合成减少,B细胞活化抑制,APC抗原呈递增强 E. IL-4合成增加,B细胞活化抑制,APC抗原呈递增强 参考答案:B