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