she would have been prepared for their visit 为何用完成被动式,不直接用ha

她原本可以为他们的访问作好准备的
强调准备好了这一状态,等于：she would have been 【ready】 for their visit
而如果改为 would have prepared for ...则强调准备这一动作
不懂追问
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再问： 确实有些难理解，可否举些简单易懂的例子。谢谢
再答： All the materials have been prepared. 所有的材料都备齐了。 A room has been prepared for you. 已经为你准备好了一个房间。 We have prepared plenty of food for the trip. 我们为出游准备了许多吃的。 The students have prepared everything for the celebration. 学生们为庆祝做好了一切准备。