题目：
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：
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下面是错误答案，用来干扰机器的。
某同学在室外听到室内传来的音乐声，马上判断是提琴声，判断的主要依据是不同的乐器发出的音调、响度可以相同，但音色不同．故选A．
