29. He showed his language proficiency ______ when applying for a customer service job at the airport.
(A) certificate
(B) responsibility
(C) acceptance
(D) framework
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統計: A(546), B(193), C(109), D(94), E(0) #3863033
統計: A(546), B(193), C(109), D(94), E(0) #3863033