我国首次在（）中，以法律的形式对职业培训经费的提取、使用等问题作出了明确的要求。 A

Not until his mother came back_______.

A．he began to do his homework

B．had he began to do his homework

C．he had begun to do his homework

D．did he begin to do his homework

一般认为，五代后蜀主孟昶的“新年纳余庆，（）”是中国第一副楹联。

规范性文件，是指区别法制范畴内的广义的立法性文件以外的，其他具有约束力的非立法性文件，也称狭义性规范性文件。

血清AST活性升高（）

A.急性心肌梗死

B.肝硬化

C.原发性肝癌

D.急性胰腺炎

E.前列腺癌