发生前庭大腺脓肿时，其病原体主要为（）、（）、（）、（）、（）、（）。
参考答案：葡萄球菌；大肠杆菌；链球菌；肠球菌；沙眼衣原体；淋菌
There are terrible noises outside because a new bridge _____ not far from here. [ ]
A. is being built
B. will be built
C. was built
D. has been built
租赁是表外业务。
