They haven't decided which hotel＿＿.A.to stay B.to stay at C.staying at D.for staying

They haven't decided which hotel＿＿.A.to stay B.to stay at C.staying at D.for staying
They haven't decided which hotel＿＿.A.to stay B.to stay at C.staying at D.for staying

They haven't decided which hotel＿＿.A.to stay B.to stay at C.staying at D.for staying
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.