Help!Professor Leen has just given a wonderful lecture,----various subjects.A.referring .B.covering C.involved D.containing 我们老师说选择B项 D项为什么不对?

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Help!Professor Leen has just given a wonderful lecture,----various subjects.A.referring .B.covering C.involved D.containing 我们老师说选择B项 D项为什么不对?
Help!
Professor Leen has just given a wonderful lecture,----various subjects.A.referring .B.covering C.involved D.containing 我们老师说选择B项 D项为什么不对?

Help!Professor Leen has just given a wonderful lecture,----various subjects.A.referring .B.covering C.involved D.containing 我们老师说选择B项 D项为什么不对?
covering是涵盖覆盖的含义,后面接抽象的..
contain包含.一般指代具体的事物,如the cup containing water,盛水的杯子