she seemed to be keen on _(there be)a birthday party for her bed-ridden daughter.为什么答案是 there being?

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she seemed to be keen on _(there be)a birthday party for her bed-ridden daughter.为什么答案是 there being?
she seemed to be keen on _(there be)a birthday party for her bed-ridden daughter.为什么答案是 there being?

she seemed to be keen on _(there be)a birthday party for her bed-ridden daughter.为什么答案是 there being?
keen on doing sth. 热衷于做某事.on是介词,后接n, V-ing.

Bing

on.是介词后面用ing