Lots of (a ) have worked on the space station.括号里填什么?

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Lots of (a ) have worked on the space station.括号里填什么?

Lots of (a ) have worked on the space station.括号里填什么?
Lots of (a ) have worked on the space station.括号里填什么?

Lots of (a ) have worked on the space station.括号里填什么?
astronomers