参考答案

正确答案：C
解析：考查分词的用法。give与scientists之间为被动关系，故排除A和B。Being given为现在分词的被动式，这种结构作状语时，一般表原因，如：Being surrounded, the enemy troops were forced to surrender. (敌军被包围了，结果被迫投降。)而本句为虚拟语气，暗含“如果，假设”之义，可补充完整为：“If they had been given enough time and money, the scientists would have been able to discover more in this field.”所以选项C为正确答案。