Researchers have debated whether economic and environmental regulations 【unduly】 burden small businesses.
A、conventionally
B、unnecessarily
C、potentially
D、virtually
【正确答案】：B
【题目解析】：句意：研究人员已经讨论过是否经济和环境法规过度地加大了小企业的负担。unduly意为“过度地，不适当地”。选项中conventionally意为“照惯例”；unnecessarily意为“不必要地，多余地”；potentially意为“可能地”;virtually意为“事实上”。故本题选B。
