为含咪唑环的抗菌药
A．异烟肼B．阿司匹林C．氧氟沙星D．小檗碱E．甲丙氨酯
参考答案：B
-- Has your elder brother returned from Africa yet?
-- Yes, but he _________ here for only three days before his company sent him to Australia.
A．was
B．has been
C．will be
D．would be
返潮
