Mr.Li is kind us,but sometimes he is kind serious. A.to;of B.with;to C.of;t——青夏教育精英家教网—

摘要：Mr.Li is kind us,but sometimes he is kind serious. A.to;of B.with;to C.of;to D.with;of

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Mr. Li is kind _________ us. But sometimes he is kind _______ serious.