who've

剑桥词典

short form of who have
（who have 的縮略形式）
Who've you asked so far ? 目前爲止你都問過誰了？

例句

• Who've you asked to your party ?
• They're the ones who've already taken the exam .
• Who've you talked to already?
• There are some boys who've done a lot of the tidying up.
• There are people who've lived here for years .
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