WhenatHarvard,hespentalotoftimeimagininghowtheworld

问题详情：

When at Harvard, he spent a lot of time imagining how the world ______ over the next 10 or 20 years．

       A．changed                                   B．has changed

       C．will change                                D．was going to change

【回答】

D

知识点：过去进行时及其被动式

题型：选择题