Computer must be of great use to ____do the scientific resea

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Computer must be of great use to ____do the scientific research.
Computers must be of great use to ____do the scientific research.
Computers must be of great use to ____doing scientific research.
分别填什么?为什么?

Computers must be of great use to（Whoever）do the scientific research.
从句缺少主语,所以是Whoever.
Computers must be of great use to （those）doing scientific research.
doing the scientific research属于现在分词短语作定语修饰those.

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