下列符合破伤风梭菌感染的条件是
A. 吞入破伤风梭菌
B. 表皮擦伤
C. 手术切口
D. 新法接生
E. 伤口形成厌氧微环境
So far as I know, more than one person _______ connected with the accident.
A. is
B. has
C. are
D. have
Every possible means _______ tried, but without much result.
A. has been
B. have been
C. are
D. is
With the company facing a serious financial situation this year, the staff ______ clearly worried about the news of job loses.
A. is
B. are
C. were
D. was