15. She is very ______ and will work hard and long to achieve objectives.
(A) cautious
(B) indifferent
(C) reluctant
(D) tenacious
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統計: A(2), B(0), C(1), D(8), E(0) #3944729
統計: A(2), B(0), C(1), D(8), E(0) #3944729