Twenty-two feet long and 10 feet in diameter, the AM-1 is one of the many new satellites that is a part of 15 years effort of subjecting the interactions of Earth’s atmosphere, oceans, and land surfaces to detailed scrutiny from space.

satellites that is a part of 15 years effort of subjecting the interactions of Earth’s atmosphere, oceans, and land surfaces satellites, which is a part of a 15-year effort to subject how Earth’s atmosphere, oceans, and land surfaces interact satellites, part of 15 years effort of subjecting how Earth’s atmosphere, oceans, and land surfaces are interacting satellites that are part of an effort for 15 years that has subjected the interactions of Earth’s atmosphere, oceans, and land surfaces satellites that are part of a 15-year effort to subject the interactions of Earth’s atmosphere, ocean, and land surface

1）请问D为什么不对？

2）在这个定语从句中，前面用are是为了和satellites一致，那么用part是因为后面的effort是不可数的吗？

我 选E。

D中an effort for 15 years that has subjected 中的that修饰不清。

我记得OG上有这样的题目 就是 that 和which前面有两个名词的时候 可以根据句意或者that/which后面的动词形式来判断修饰的是哪个名词。

这里D中an effort for 15 years that has subjected has的出现明显是修饰an effort，所以that没有修饰不清的错误。我否定D是认为has subjected的时态错误。