LESSON/ DIFFICULT/ THE/ IS/ SO/ NOBODY/ THAT/ UNDERSTAND IT/ CAN.A....
5. lesson/ difficult/ the/ is/ so/ nobody/ that/ understand it/ can.
A. The lesson is difficult so that nobody can understand it.
B. The lesson it is so difficult that nobody can understand .
C.The lesson is so difficult that nobody can understand it.
D. The lesson so is difficult that nobody can understand it.