Reply to "What does "those" refer to in this sentence?"

Hi, Apple,

Answer 1: Yes, it is a typo.

Answer 2: "those" refers to "advance jobs."

Answer 3: More than necessary, I think "those" makes that exemplification clearer. Without "those," I'd use "as" instead of "such as" (do you agree, David and DocV?):

"It also limits potentially qualified students from participating in the talent pool tapped to fill advance jobs where the work force is dwindling, as (is the case/happens) in science, technology and engineering."

While the phrase starting with "such as" refers back to the noun phrase "advance jobs" --hence the convenience to use "those"--, the "as"-phrase is more like a sentence modifier. Notice that we could replace it with "which": "... which is the case/which happens in science, technology and engineering."

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