为你解答.
Have you (found,找到) the book you have been (looking for)?
你找到了那本你一直在寻找的书吗?
解释：选择A项.第一空要填found（找到物品）而不是found out（查明事实）；第二空要填look for（强调行为）而不是find（强调结果）.