治疗梅毒药物首选
A．红霉素类药物B．氯霉素类药物C．金霉素类药物D．青霉素类药物E．链霉素类药物
参考答案：D
新民主主义革命的基本纲领是什么？
I'd done the same job for years and felt it was time to ________. [ ]
A. move on
B. go on
C. have on
D. take on
