―Alice,youlookpuzzled.Haveyouunderstoodit?―Yes,I       ...

问题详情：

―Alice, you look puzzled. Have you understood it?

―Yes, I          another problem just now.

       A．have thought of    B．thought of           C．was thinking of    D．had thought of

【回答】

知识点：其他

题型：选择题