阿摩線上測驗
7 In a new study, scientists have pinpointed that mastering a second language is rather challenging and that chances of reaching fluency after a certain age in a second language seem to .
(A) procure
(B) protract
(C) liquidate
(D) plummet
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統計： A(1), B(0), C(1), D(0), E(0) #2456304
統計： A(1), B(0), C(1), D(0), E(0) #2456304
