【正确答案】 C

【答案解析】[解析] 画线词dimly为副词，意为“昏暗地”。A项inadequately意为“不足”，例：That area of the product was inadequately tested.那个领域的产品没有进行充分测试。B项hardly意为“几乎不”，例：I can hardly hear him.我几乎听不到他说话。C项faintly意为“暗淡地；微弱地”，例：The moon glimmered faintly through the mists.月亮透过薄雾洒下微光。D项sufficiently意为“充分的；足够的”，例：The soup is not sufficiently salty.这汤成味不够。故选C。