起草单位应当于规范性文件有效期届满前（）内进行评估。
A.6个月
B.3个月
C.2个月
D.1个月
参考答案：A
论文中（）是恩格斯著名的民间文学论文。
--Our guests are coming from Shanghai at 10:30.---Oh, I ___ it ___11:30.
A．think, is
B．thought, was
C．have thought, will be
D．had thought, would have been
