Thisisthehotel（）lastmonth

A.whichtheystayed

B.atthattheystayed

C.wheretherestayedat

D.wheretheystayed
答案
D
解析
A.which要加at，whichtheystayedat

B.atwhichtheystayed

C.where不用加atwhere可以相当于atwhich，wheretherestayed

D是正确的