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

A. rational           B. arbitrary         

C. mechanical        D. predictable

B


解析:

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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