12. How would you like if you were watching your favorite TV program and someone came into the room and just shut it off without asking you?
句意为：如果你正在看你最爱的电视节目，，然后一个人进了屋，问都没问你就把电视关掉了，你会是什么感受？分析句子结构可知，if引导的宾语从句是本句真正的宾语，空格处是形式宾语，只有it可以充当形式宾语。故选D。
理解句子意思并且选出合适的代词。
代词的用法