It was the president's speech that the secretary spent the whole morning at home.
A. to prepare
B. preparing
C. prepared
D. be prepared
网友回答
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 president's speech the secretary spent the whole morning at home，调整结构后是the secretary spent the whole morning at home the president's 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。