1 . Hydrogen peroxide _____ as a bleaching agent because it effectively whitens a variety of fibres abd surfaces.
- A. used
- B. is used
- C. is using
- D. that it use
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ক ইউনিট ২০১৬-২০১৭ || ঢাকা বিশ্ববিদ্যালয় || 2016
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