My father has _______ a worker for ten years. [ ]
A. be
B. being
C. is
D. been
答案:D
易与霍奇金淋巴瘤和恶性组织细胞病相混淆的淋巴瘤的亚型是()
A.以上均易混淆
B.ALCL
C.MZL
D.MCL
E.FL
蜂窝技术不是分割地理区域而是分割频率。()