他们花了三个月的时间做这项试验。的翻译：It took them three months to do the test. 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

They spent three months time to do the test.

It took them three months to do the test.

They spent three month-long time to perform this experiment.

They spent 3 months of time to do this pilot.

It took them three months to do the test.