对鼠疫患者密切接触者的紧急预防措施为（）
A.肌内注射丙种球蛋白
B.注射菌苗
C.严格隔离
D.预防用药
E.免疫调节
参考答案：D
— it was a easy test and he ________, but he didn't.
— Nothing is worse than when you feel let-down. [ ]
A. should have passed
B. need have passed
C. must have passed
D. may have passed
