who'd

剑桥词典

short form of who had
（who had 的缩略形式）
She wondered who'd sent her the mysterious email . 她想知道是谁给她发的神秘电子邮件。

short form of who would
（who would 的缩略形式）
Well, who'd have thought Joey was going to become so successful ? 谁会想到乔伊会变得如此成功？

例句

• Who'd like another piece of cake ?
• I wondered who'd written the note .
• Who'd have thought that Kevin would do so well?
• He asked who'd unlocked the door .
• He is the man who'd never been on a plane .
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