____ he met with the difficulty did he realize that our help was of great importance
A．It was only whenB．Never untilC．Only beforeD．It was not until
B

試題分析:句意：直到他遇到了困難他才意識到我們的幫助非常重要。根據(jù)句中的did he realize…判斷此處是倒裝結(jié)構(gòu)，排除AD選項，而C選項邏輯混亂，故答案選B。
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