单选题 Nevertheless, researchers of the Pleistocene epoch have developed all sorts of more or less fanciful model schemes of how they would have arranged the Ice Age ______ in charge of events.
A. they had been B. had they been
C. they had have been D. were they

【正确答案】 B

【答案解析】[解析] if引导的虚拟从句在省略if时，谓语动词提到主语前面，形成主谓倒装。本句中had提到they前面，形成had they been的倒装结构。how引导了倒装句，正常语序应是：If they had been in charge of events，they would have arranged the Ice Age in fanciful model schemes．由于。model schemes作主句谓语动词developed后面的宾语，how引导的定语从句修饰宾语，形成倒装，因此，B选项正确。