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____ Helen’s knowledge and vocabulary expanded, she asked more and more questions.
A.WhenB.WhileC.AsD.Before
C

试题分析:连词辨析。A当…时;B然而,尽管;C随着;D在…之前;句意:随着Helen的知识和词汇的增加,她询问了越来越多的问题。故C正确。
点评:此题主要考查连词的辨析,选择连词主要是看前后句的关系,因果关系用表因果的连词,转折关系用转折连词,并列关系用并列连词,要求考生具有一定的句子分析能力和词义辨析能力。
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