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.
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