| The mobile phone was _____ for at least five years against the bug, but it was wrong only one year later. |
A. ensured B. guaranteed C. protected D. promised |
科目：高中英語 來源：同步題 題型：單選題
科目：高中英語 來源： 題型：
The mobile phone was ______ for at least five years against the bug，but it went wrong only one year later．
A．recommended B．guaranteed C．protected D．promised
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