那是谁说的？
Who (Whom) are you waiting for?
你在等谁呢？
The teacher for whom you are waiting is coming.
你等的那位老师来了。
Do you know who (whom) they are waiting for?
你知道他们在等谁吗？
The professor (whom) you are waiting for has come.
你正在等的教授已经来了。
Whom (Who) are you waiting for?
你在等谁呢？
Whom (Who) are you waiting for?
你在等谁呢？
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