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

Only when he read the newspaper _____ the US President Obama would deliver a speech in Fudan University.

1. A.
   he knew
2. B.
   he knows
3. C.
   does he know
4. D.
   did he know

Only when he read the newspaper ________ the US President Obama would deliver a speech in his university．

1. A.
   he knew
2. B.
   he had known
3. C.
   had he known
4. D.
   did he know

Only when he read the newspaper _____ the US President Obama would deliver a speech in Fudan University.

  A. he knew               B. he knows                  C. does he know            D. did he know

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