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Large quantities of information___since then as to how the program has worked.
A.has been offeredB.were offeredC.have been offeredD.was offered
C

试题分析:句意:自从那时起,大量的关于这个项目怎么运作的信息已经被提供。和since then连用,应该用现在完成时,排除BD,因为主语是Large quantities of information,谓语和quantity的数保持一致,所以用复数,选C。
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