4. By the time my father _____ next year, he will have worked for his company for over thirty years.
(A) replaces
(B) recalls
(C) retires
(D) remains
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統計: A(1), B(0), C(70), D(2), E(0) #3253535
統計: A(1), B(0), C(70), D(2), E(0) #3253535