问题
选择题
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
答案
答案：C
题目分析：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。