目前我国普遍使用的伤寒疫苗为( )
A．Ty21a减毒活菌苗B．全菌灭活疫苗C．类毒素疫苗D．Vi疫苗E．三联疫苗
参考答案：D
-Has your father 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
被誉为世界“购物天堂”的我国的城市是（）。
A.香港
B.上海
C.广州
D.澳门
