Tom,you look unhappy today.What____ (发生)?

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Tom,youlookunhappytoday.What____(发生)?Tom,youlookunhappytoday.What____(发生)?Tom,youlookunhappytoday.Wh

Tom,you look unhappy today.What____ (发生)?
Tom,you look unhappy today.What____ (发生)?

Tom,you look unhappy today.What____ (发生)?
happened

has happened
用发生过(过去时)已经发生(现在完成时)