阿摩線上測驗
16.________ by the lack of interest in his proposal, he proceeded to put forward his alternative idea.
(A) Discouraging
(B) Had discouraged
(C) Was discouraged
(D) Discouraged
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統計： A(40), B(35), C(9), D(348), E(0) #2982913
統計： A(40), B(35), C(9), D(348), E(0) #2982913
