A. Instead B. First C. Later D. Once
A. colleague B. passenger C. suitcase D. taxi
A. hospital B. company C. university D. accommodation
A. intended B. promised C. managed D. deserved
A. 链球菌磷壁酸 B. 链球菌肽聚糖 C. 链球菌荚膜 D. 链球菌胞壁F蛋白 E. 链球菌胞壁M蛋白
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