第一节:单项填空(共15小题;每小题1分,满分15分)
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
21. I haven’t read _______of his books, but judging from the one I have read I think he’s a very promising writer.
A. any B. none C. both D. either