who's

劍橋詞典

short form of who has
（who has 的縮略形式）
Who's been chosen , do you know ? 你知道誰被選中了嗎？

short form of who is
（who is 的縮略形式）
Who's that talking to Jason? 那個(gè)同賈森談話的人是誰？

例句

• Who's going to go first?
• I don't know who's in charge round here.
• She's the woman who's going to be our new teacher .
• If I find out who's responsible for the damage , they'll be in trouble !
• Who's allowed to go in there?
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