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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
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科目：高中英語 來源：同步題 題型：單選題

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

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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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