have you seen Anna?Yes ,she----------books in library Ai.is looking for B.looked for
人气：421 ℃ 时间：2020-03-19 06:03:17
解答
A.不过我觉得没有选项的话was looking for更合理,因为提问者使用了现在完成时
be doing是现在进行时
did是一般过去时
相比较a更贴合语句意思.
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