It was the president's speech that the secretary spent the whole morning at home.A. to pr

问题补充：

It was the presidents speech that the secretary spent the whole morning at home.

A. to prepare

B. preparing

C. prepared

D. be prepared

答案：

A. to prepare

(答案→)B. preparing

C. prepared

D. be prepared

解析：本题考查非谓语动词。去掉It was…that后剩下的部分为 the presidents speech the secretary spent the whole morning at home，调整结构后是the secretary spent the whole morning at home the presidents speech。结合选项可知句意是：秘书花了整个早上在家为总统准备演讲。由此判断考查的是spend time （in）doing sth句型。