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Christina wasn’t saying anything, but the professor smiled at her _______she had done something very clever.
A.as ifB.now thatC.whileD.though
A      

试题分析:考查连词;A. as if好像,B. now that既然,C. while虽然,当…时候,D. though虽然,句意:Christina没有说什么,但教授对她微笑,好像她做了聪明的事。选A。
点评:连词要记住各个连词的词义,在做题时要注意上下文的逻辑关系。
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