阿摩線上測驗
16. It is no doubt a fact that _____ form of energy.
(A) electricity is the most useful
(B) electricity the most useful
(C) the most useful in electricity
(D) electricity being the most useful
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統計： A(189), B(2), C(0), D(12), E(0) #2856566
統計： A(189), B(2), C(0), D(12), E(0) #2856566
