柜员日结有()种方式。
A.一
B.两
C.三
D.四
参考答案:B
肾功能不良的患者禁用()
A.青霉素G
B.耐酶青霉素类
C.广谱青霉素
D.第一代头孢菌素
E.第三代头孢菌素
---- I wonder how much you charge for your services.
---- The first two are free ____ the third costs $30.
A.while
B.until
C.when
D.before