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 obscure表示“不易看清的；令人费解的；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“可疑的；无把握的”；intriguing表示“饶有兴趣的；迷人的”。根据句意可知应选A项obscure。

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