—This returned scholar has become one of the top experts in this field.
—Yes, I know him very well. He ______ for ten years at an institute in the USA.
A. has worked B. has been working C. worked D. had worked
第一节单项填空(共15题;每小题1分,满分15分)
请认真阅读下面各题,从题中所给的A、B、C、D四个选项中,选出最佳选项, 并在答题卡上将该项涂黑。
The book focuses on _____ tragedy of Ron Williamson, a baseball hero from _____ small town in Oklahoma.
A. a; theB. the; theC. the; a D. /; a