His lecture was difficult and I didn’t know ________ he said meant in his lecture．

1. A.
   that
2. B.
   what
3. C.
   that that
4. D.
   what what

His lecture was difficult and I didn’t know __________he said meant in his lecture.

A. that　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 B. what

C. that that　　　　　　　　　　　　　　　　　　　　　　　　　　  D. what what

A. that　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 B. what

C. that that　　　　　　　　　　　　　　　　　　　　　　　　　　  D. what what