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

試題分析：連詞辨析。A當…時；B然而，盡管；C隨著；D在…之前；句意：隨著Helen的知識和詞匯的增加，她詢問了越來越多的問題。故C正確。
點評：此題主要考查連詞的辨析，選擇連詞主要是看前后句的關系，因果關系用表因果的連詞，轉折關系用轉折連詞，并列關系用并列連詞，要求考生具有一定的句子分析能力和詞義辨析能力。
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