At this moment, they are still () with many economic problems. A. centered B. believed C. referred D

At this moment, they are still () with many economic problems. A. centered B. believed C. referred D. confronted

The correct answer is D. confronted. The sentence structure requires a verb that forms a collocation with "with" to express facing difficulties. "Confronted with" means to be faced with or challenged by something, which fits the context of dealing with economic problems.

Other options are incorrect because:

A. centered would require the preposition "on" (centered on), not "with"

B. believed and C. referred do not form logical collocations with "with" in this context

The completed sentence reads: "At this moment, they are still confronted with many economic problems." This phrasing naturally conveys the idea of facing ongoing economic challenges. When describing difficult situations, "confronted with" is a common and precise collocation in both spoken and written English.