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
B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。