It was the old clock that the old man spent the whole morning at home.A repairing B to rep

问题补充：

It was the old clock that the old man spent the whole morning at home.

A,repairing B,to repair C,repaired D,repair

答案：

解析：这个句子中包含一个强调句型，因为去掉it was和that，剩下的是一个完整的句子，所以是强调句型。又因为分词动作“repair ”与其逻辑主语“the old man”之间是主动关系，故用现在分词作原因状语。