13. She managed to secure a promotion, which can be attributed ______ her hard work and dedication over the years. Many of her colleagues were impressed by her determination.
(A) on
(B) by
(C) with
(D) to
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統計: A(3), B(2), C(0), D(10), E(0) #4000504
統計: A(3), B(2), C(0), D(10), E(0) #4000504