Very few people could understand the lecture the professor delivered because its subject was very______.

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问题 Very few people could understand the lecture the professor delivered because its subject was very______.

选项 A、obscure
B、indefinite
C、dubious
D、intriguing

答案A

解析 形容词辨析题。obscure表示“不易看清的;费解的;不清楚的”;indefinite表示“不确定的,不明确的”,但未必就难以理解;dubious表示“半信半疑的;结果未定的”;intriguing表示“饶有兴趣的,迷人的”。根据句意应选[A]obscure。
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