阿摩線上測驗
14 It is hard to predict the success of space travel since it is an______ territory.
(A) unexplored
(B) unlucky
(C) unsuitable
(D) unaffordable
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統計： A(45), B(1), C(8), D(10), E(0) #2654260
統計： A(45), B(1), C(8), D(10), E(0) #2654260
