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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?

分类: 作业答案 • 2022-03-15 12:51:11

问题描述：

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

答

keen on doing sth. 热衷于做某事.on是介词,后接n, V-ing.