He was unaware of the financial crisis involed, so his choice was quite_____.

   A. rational            B. arbitrary           C. mechanical         D. predictable

B


解析:

B考查形容詞詞義辨析。rational理性的，合理的；arbitrary武斷的，任意的符合句意；mechanical機(jī)械的；predictable可預(yù)見的。

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