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According to Professor Johnson, we don’t...

According to Professor Johnson, we don’t have to read the book if we don’t want to, as it is ______.

A.worthwhile B.necessary C.optional D.serious

 

C 【解析】   考查形容词词义辨析。句意:根据约翰逊教授的说法,如果我们不想读这本书,就不必读,因为它是可选择的。A. worthwhile值得的;B. necessary必要的;C. optional 可选择的,选修的;D. serious严肃的,认真的。根据“we don’t have to read the book if we don’t want to”可知,这本书读不读都可以,由此可知,它是“可选择的”。故选C。  
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