It took us four hours to do this project.(保持原句意思)_______ _______four hours _______this project.

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It took us four hours to do this project.(保持原句意思)_______ _______four hours _______this project.
It took us four hours to do this project.(保持原句意思)
_______ _______four hours _______this project.

It took us four hours to do this project.(保持原句意思)_______ _______four hours _______this project.
We spent...on...
注意区分Spend some time on sth/(in) doing sth.

we spent ..on...

We spent four hours on this project.

We spent...on...
spend some time on sth.(名词或代词)
spend some time in doing sth.