Large quantities of information＿＿＿since then as to how the program has worked.
A. has been offered
B. were offered
C. have been offered
D. was offered
网友回答
A. has been offered
B. were offered
(答案→)C. have been offered
D. was offered
解析：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。