【题目】He always seems so confident, but ________ he's sometimes extremely nervous during some exams.
A.in trouble
B.in anger
C.in reality
D.in relief

【答案】C
【解析】in trouble处于困境；in anger生气；in reality事实上；in relief如释重负，松了口气。根据句中的转折关系可知，他事实上在一些考试期间还是很紧张的。故答案选C。