Although he has been asked hundreds of questions during five days as a witness, Lt. Col. Oliver L. North has still not been quizzed about many aspects of the Iran-contra affair in which he was involved. For example:

North has said repeatedly that all his actions were authorized, but he has not been asked to spell out who approved numerous specific actions he took, nor to explain how approval was given. For example, North testified that former national security adviser Robert C. McFarlane instructed him to keep the Nicaraguan contras' "body and soul" together, but no one has asked North whether McFarlane -- or anyone else -- specifically ordered him to set up a private operation to fly arms to the rebels.

North has acknowledged that he worked with conservative fund-raiser Carl R. (Spitz) Channell and public relations executive Richard R. Miller, who have pleaded guilty to criminal charges involving their fund-raising that named North as a coconspirator. But North has not been asked how he became involved with the two and who approved setting up an off-shore company to receive funds raised through Channell and Miller.

Last Nov. 24th, the day before North was fired, he met with attorney Thomas C. Green, retired Air Force major general Richard V. Secord and Secord's business partner Albert A. Hakim. Green then apparently represented all three of the others. There have been suggestions that the four men plotted a defense strategy that day. After the meeting, Green told Justice Department officials that the idea of diverting profits from arms sales to Iran to the contras came from Hakim, an assertion since contradicted by North. No one has asked North about the meeting of the four men, or whether he knew Green planned to blame Hakim for the diversion.

No one has taken North carefully through the events of Nov. 21-25, a period when some investigators believe a cover-up was being concocted. North's secretary, Fawn Hall, has given testimony on the removal of documents from North's office on Nov. 25 that conflicts with North's description last week.

North has not been asked about his extensive dealings with a phony Saudi prince -- actually an Iranian con man under investigation by the FBI -- whom North wooed for a contribution to the Nicaraguan contras in 1985-86.