Only when he read the newspaper _____ the US President Obama would deliver a speech in his

university. [ ]

A. he knew          

B. he had known      

C. had he known  

D. did he know

经济补偿按劳动者在本单位工作的年限，每满一年支付（）工资的标准向劳动者支付

A.半个月

B.一个月

C.一个半月

D.二个月