39．Could you please tell me         ?

    A．when will the bus leave    B．when the bus will leave

    C．when had the bus left      D．when the bus had left

38．Some confusing and misleading ads are aimed    at teenagers．That made parents       .

    A．gradually，guilty  B．normally，embarrassed  C．specially,  tense  D．mostly, pleased

37．When I arrived at the office，the meeting        for ten minutes．

    A．had begun    B．had been on    C．began    D．was beginning