15. He was concerned about the condition of factory and mine workers while they were at work,
the _____ nature of making a living through such work, and the effects of the factory system on the family
life of workers.
(A) capricious
(B) vicarious
(C) precarious
(D) vivacious
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統計: A(3), B(9), C(22), D(0), E(0) #1802813
統計: A(3), B(9), C(22), D(0), E(0) #1802813