22 Although this problem( )many times,it was too difficult(

学习 时间:2026-05-30 21:55:44 阅读:3105
22 Although this problem( )many times,it was too difficult( )A has been explained;to understandB was explained;to be understoodC is being explained;to be understoodD had been explained;to understand1 把题目和选项都翻译一遍2 说出正确选项3 解释为什么.越详细越好.

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2026-05-30 21:55:44

主句过去时,many times用完成时,所以用过去完成时English is easy/ hard/ difficult to learn。语法要求不能变动,所以D

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    2026-05-30 21:55:44

    主句过去时,many times用完成时,所以用过去完成时English is easy/ hard/ difficult to learn。语法要求不能变动,所以D

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