昨天，我花了好几个小时才完成作业。用英语怎么说。开头是it

it 开头可能是强调句，具体可以有多种写法，看你具体强调什么。

比如：

1. 强调是你而不是别人花了好几小时写完作业：

   It was me who spent several hours on homework yesterday.

2. 强调是好几小时而不是其他时间；

   It were several hours that I spent on my homework yesterday.

3. 强调是作业而不是其他事情；

   It was my homework that cost me several hours yesterday.

4. 强调是昨天而不是其他日期； 

   It was yesterday that I spent several hours on my homework.

还有一种形式主语的it开头句式：It took me several hours to finish my homework.

注意take 和spend 的用法不一样，包括主语和介词是不同的哦。

如果需要的不是强调句而是其他句式可以追问啊~~

求采纳~

It took me several hours to finish my homework.