题目内容：
我在回答考试时的问题时非常紧张,以至于我的心里七上八下的。 [ 2 分 ]A.When I was answering the exam questions I was such nervous that I could feel butterflies in my stomach.
B.When I was answering the exam questions I was so nervous that I could feel butters in my stomach.
C.When I was answering the exam questions I was so nervous that I could feel butterflies in my stomach.
D.I was answering the exam questions I was so nervous that I could feel butterflies in my stomach.
参考答案：