填空题____
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参考解析
解析：
此处根据助动词“have”和形容词“constant”，可知该处应填入一个系动词的过去分词，意为“保持不变”，故正确答案为B项。
此处根据助动词“have”和形容词“constant”，可知该处应填入一个系动词的过去分词，意为“保持不变”，故正确答案为B项。
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