精选优质文档-倾情为你奉上2011年普通高等学校招生全国统一考试英语(北京卷)第一节 单项填空(共15小题;每小题1分,共15分)21. Experience of this kind in both the U.S. and Europe well before the Second World War.A. have conducted B. have been conductedC. had conducted D. had been conducted22. Barbara Jones offers to her fans is honesty and hapiness.A. Which B. What C. That D. Whom23.Tom in the library every night over the last three months.A. works B. worked C. have been workin