you come to Brunei, you would have to take off your shoes before going inside someone’s h

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(答案→)A. should
B. had
C. were
D. if
解析：本题考查虚拟语气。这是一个表示将来的虚拟。从句should you e to Brunei=if you should e to Brunei.主句，Another thing is that you would have to take off your shoes before going into.表将来用would +动词原形。选A。