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    精英家教网 > 高中英语 > 题目详情
    Prices____ all the time and no one knows when they         stable.
    A．are going up; becomeB．have been going up; will become
    C．have gone up; will becomeD．have been gone up; become
    B
    考察时态。根据all the time一直可知第一空应该使用现在完成进行时。第二空是宾语从句，根据句意可知是将来时。句意：物价一直都在上涨。没有人知道什么时候会稳定下来。故B正确。
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