The subject of these lectures______by the lecture committee.

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问题 The subject of these lectures______by the lecture committee.

选项 A、announces
B、have been announced
C、announced
D、has been announced

答案D

解析 这句话的主语是subject,谓语动词应该用单数形式,故排除B项。而主语与谓语announce之间是被动关系,用被动语态。故本题选D。
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