31. Immigrants need to become _____ in their jobs; otherwise, their economic future will be in jeopardy.
(A) available
(B) incidental
(C) proficient
(D) segregated

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統計： A(7), B(1), C(13), D(2), E(0) #1021384

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#3272908
(A) available 可用的(B)...
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