完形填空（共20小题；每小题1.5分，满分30分）
阅读下面短文，掌握其大意。然后从21--40各题所给的四个选项中，选出最佳选项
I wished I had known earlier the fact that I was a low achiever because there was a reason beyond my control. Then I 21 have worked so hard in my late twenties and early thirties. But I just didn’t 22 that. I was writing and writing. I was working for no other reason than to hear people praise me.
