A : We are going to have a dancing party. W ould you like to join us, Diana? B: I’ d love to, but I’ m afraid I can ’ t. I have to pick up my mother tonight at the airport. ( ) What is Diana going to do tonight?
A.
To take part in a dancing party.
B.
To bring her mother to the party.
C.
To pick up her mother tonight at the airport.
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【单选题】假设y t = 0.4 + e t + 0.5 e t-1 - 0.3 e t-2 , y t 的无条件均值等于?