If it were "they have been gathering", that would lead the reader to believe that the museum is still gathering artifacts at this very moment. Generally, an exhibition of this magnitude will have been planned and cataloged well in advance. Even the emplacement and lighting of the artifacts will have been thought through long before the exhibit begins.
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TerryxpressNo way! The other driver might see it that way, with the idea that he can get me to relinquish the space; but I am the speaker of the fateful words (in Present Perfect Continuous), and `'it's mine."You are justifying your position with the argument: "I have been trying for a longer time that you, so I deserve this space".
TerryxpressWe need to think further about the nature of Present Perfect Continuous!Let's take it slowly and start by looking at these three verb forms:
It rained.
It has rained.
It has been raining.First sentence clearly refers to past action.