OG12-89没有查到，所以麻烦大家现给解释一下啦

Since it has become known that several of a bank's top executives have been buying shares in their own bank,the bank's depositors,who had been worried by rumors that the bank faced implending financial collapse,have been greatly relieved. The reason that, since top executives evidently have faith in the bank's financial soundness, those worrisome rumors must be false.Such reasoning might well be overoptimistic, however,since corporate  executives have been known to buy shares in their own company in a calculated attempt to dispel negative rumors about the company's health.

BF题

我就纠结于两个答案

A The first describes evidence that has been taken as supporting a conclusin;the second gives a reason for questing that support

D The first describes the circumstance that the argument as a whole seeks to explain;the second gives the explanation that the argument seeks

to establish.

答案选A，可我咋也想不明白，我选的是D。

麻烦大家乐

这题我也选D刚开始。。看了viviansecret的解释恍然大悟。。。

可能题目把SINCE提前的原因引起误会。。。

vivian解释得很清楚。关键是要弄明白哪个是conclusion，哪个是support,哪个是argument。bf题我也常晕，看选项恨不得总觉得哪个都有道理。