They haven't decided which hotel＿＿.A.to stay B.to stay at C.staying at D.for staying
问题描述：
They haven't decided which hotel＿＿.A.to stay B.to stay at C.staying at D.for staying
答
B stay at a hotel
原来的语序 应该是这样的 decided to stay at which hotel ,把后面的调一下,就得答案了.