Very few people could understand the lecture the professor delivered because its

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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

解析很少有人能听懂教授的这场讲座，因为它的主题太令人费解了。形容词辨析题。obscure表示“费解的”；indefinite表示“不确定的，不明确的”，但未必就难以理解；dubious表示“可疑的；无把握的”；intriguing表示“非常有趣的，迷人的”。根据句意可知应选A项obscure。

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