The clever boy made a hole in the wall, _______ he could see _____ was going on inside house. The clever boy made a hole in the wall, _______ he could see _____ was going on inside house. A. which; what B. through which; what C. through that; what D. what; that The clever boy made a hole in the wall, _______ he could see _____ was going on inside house. A. which; what B. through which; what C. through that; what D. what; that