答案：B

主要测试宾语从句。由具体的语境可知语境中动词say的宾语既是后面的两个句子，另外结合具体语境可知句子______ his sister had passed the entrance examination of college, and______she would go to college in about 20 days中只是需要引导宾语从句的引导词，故此答案只能选择两个that。译文：他说他妹妹已经北大学录取了，并且二十天后就去上大学了。