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    精英家教网 > 高中英语 > 题目详情
    He promised to help me and then_________.
    A．back outB．backed outC．backed ofD．backed on
    B
    词义辨析。back out不遵守诺言；backed of在……后边；backed on背靠。句意：他许诺了帮助我，然后又反悔了。根据句子谓语promised，所以用一般过去时，选B。
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