The lecture was informative, but some explanations were ____ and added little value.
Aessential
Bengaging
Cconcise
Dgratuitous正確答案
答案與詳解
D
正確答案
轉折詞 but 與 added little value 提示空格需填入負面且表「多餘」的形容詞，gratuitous 符合題意。
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