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参考答案：错
When ____about his family, he is always refusing to answer.
A．asked
B．asking
C．being asked
D．mentioned
导致胆囊收缩素分泌的主要因素为
A．酸性胃液刺激B．食物头相刺激C．脂肪食物刺激D．蛋白质食物刺激E．迷走神经兴奋
