excited his parents most is that he had passed the entrance exam and was admitted into his dream college.
A. That
B. What
C. Which
D. It
网友回答
A. That
(答案→)B. What
C. Which
D. It
解析：考查主语从句的引导词。本题的what引导起主语从句what excited his parents most.并在句中做主语。句意：让他的父母亲最高兴的是他通过了高考被心中的大学所录取。故B正确。