Not until __________ on TV __________ that the Chinese ship was rescued by the European Union Task Force.

A．did I turn; did I know

B．did I turn; I knew

C．I turned; did I know

D．I turned; I had known

提高植物的根冠比的肥水措施（）。

A.多施N肥多浇水

B.多施N肥少浇水

C.多施N肥和K肥

D.多施P肥控制水