The boy became fatter and fatter each day and made his parents sad.A. which B. what C. he

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A. which
B. what
C. he
(答案→)D. it
解析：考查并列句，此题由连词and 连接，前后应是完整的句子，第二个分句缺少主语故用it ,若把连词and去掉，前加上逗号，可选which看成非限制性定语从句，所以选D。