13.To be able to speak a foreign language ________ is quite an achievement.
(A) fluently
(B) unspeakably
(C) unknowingly
(D) favorably
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統計: A(181), B(26), C(15), D(28), E(0) #2263154
統計: A(181), B(26), C(15), D(28), E(0) #2263154