21．—Are you still thinking about yesterday's party?
—Oh, that's ________.
A．what makes me feel excited
B．whatever I fell excited about
C．how I feel about it
D．when I feel excited
答案与解析：A 考查表语从句。what引导名词性从句时，充当句子的成分，可作主语、宾语或表语，此题中what引导的是表语从句，它在从句中作主语。
