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It is over two years since my brother ______the army.
A. joins
B. joined
C. has joined
D. had joined
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9、如果知识图谱中有David和Mike两个节点，他们之间具有classmate和brother关系。在知识图谱中还存在其他丰富节点和丰富关系（如couple, parent等）前提下，下面描述不正确的是（）A．可以从知识图谱中形成classmate＜David, Mike＞的表达，这里classmate是谓词。B．可以从知识图谱中形成brother＜David, Mike＞的表达，这里brother是谓词。C．可从知识图谱中找到classmate和brother这个谓词的正例和反例。D．仅可从知识图谱中找到classmate和brother这个谓词的正例，无法找到这两个谓词的反例。
考题
如果知识图谱中有David和Mike两个节点，他们之间具有classmate和brother关系。在知识图谱中还存在其他丰富节点和丰富关系（如couple, parent等）前提下，下面描述不正确的是（）A．可以从知识图谱中形成classmate＜David, Mike＞的表达，这里classmate是谓词。B．可以从知识图谱中形成brother＜David, Mike＞的表达，这里brother是谓词。C．可从知识图谱中找到classmate和brother这个谓词的正例和反例。D．仅可从知识图谱中找到classmate和brother这个谓词的正例，无法找到这两个谓词的反例。
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