阿摩線上測驗
12. Knowing several______helpful if you work for an international corporation.
(A) languages are
(B) language is
(C) languages is
(D) language are
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統計： A(13), B(18), C(104), D(2), E(0) #923640
統計： A(13), B(18), C(104), D(2), E(0) #923640
