he had been told many times but he still couldn't understand itbut前面的应如何变成非谓语动词形式?求讲解

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• he had been told many times but he still couldn't understand itbut前面的应如何变成非谓语动词形式?求讲解
• （）many times,but he still could not understand it.A:Having been told B:He had been told 为什么选B不选A,
• 1.__________(tell) many times,he still couldn't understand.A.Having been told .B.Told C.He was told D.Though he had been told为什么选A,而不选B?B项在什么情况下可以用?与A项又有什么区别?