7. The lecture was informative, but some explanations were ________ and added little value.
(A) essential
(B) engaging
(C) concise
(D) gratuitous

答案：登入後查看
統計： A(0), B(0), C(1), D(2), E(0) #3929997

詳解 (共 1 筆)

#7432099
gratuitous 不必要的、多餘的／免費的、無償的
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