阿摩線上測驗
38 The invention of the light bulb was a major ______in human history because this invention allows for longer productive hours and improved quality of life at night.
(A) hardship
(B) dispute
(C) milestone
(D) bargain
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統計： A(0), B(0), C(8), D(0), E(0) #3226640
統計： A(0), B(0), C(8), D(0), E(0) #3226640
