题目

完形填空 Mr. Glen is a millionaire. Five years ago, after returning from abroad to his motherland, he 1 his small company. Speaking of success, Glen often tells us a story about his extra expensive “school” fee. He always 2 his success to it. At that time, Glen, who already got a Ph.D. degree, 3 to return to the homeland, starting a company. Before leaving, he bought a Rolex watch with the 4 made through years of work after school and the scholarships. At the airport he had to accept the 5 customs check. The watch on his wrist was also demanded to be taken down for 6. Glen knew that ca已知方程组的解是（   ）．A．B．C．D．