22、They have ____ that any faulty parts will be replaced free of charge.
A.
allowed
B. guaranteed C.
ensured
D. protected
22、B
科目：高中英語(yǔ) 來(lái)源： 題型：
They have ____ that any faulty parts will be replaced free of charge.
A. allowed B. guaranteed C. ensured D. protected
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