Large quantities of information, as well as some timely help _____ since the organization was built .
A.has offered
B.had been offered
C.have been offered
D.is offered
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C解析这题考查时态语态，时间是：since the organization was built . 所以用现在完成时，主语是as well as连接的，和前面的主语一致，前面的主语是：Large quantities of information和quantity的数一致，而且 是被提供，选 C。