3. If you invest smartly, you may save a _____ amount of money for your retirement years.
(A) sustaining
(B) subsidiary
(C) secondary
(D) substantial
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統計: A(23), B(28), C(6), D(131), E(0) #826745
統計: A(23), B(28), C(6), D(131), E(0) #826745