She is not good at football. [ ]
A. play
B. to play
C. playing
D. plays
答案：C
Living with a host family while studying abroad, in which there may be some other college students, __________ you the chance to learn more about the new culture.
A．give
B．gives
C．giving
D．to give
杀伤病毒感染的靶细胞主要依靠（）
A.细胞免疫
B.体液免疫
C.粘膜免疫
D.单核吞噬细胞系统
E.补体系统
