一线抗结核药包括
A．异烟肼
B．利福平
C．乙胺丁醇
D．对氨水杨酸
E．链霉素
参考答案：A,B,C,E
Glad to see you back. How long _______ in Russia?
A．did you stay
B．have you stayed
C．were you staying
D．have you been staying
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