39. Why were early electric hearing aids difficult to use in daily life?
(A) They were expensive.
(B) They were big and heavy.
(C) They needed internet access.
(D) They did not work outdoors.
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統計: A(0), B(31), C(0), D(1), E(0) #3455505
統計: A(0), B(31), C(0), D(1), E(0) #3455505