Xie Lei, a student studying abroad, highly recommends that you a substitute family to be w

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A. had
(答案→)B. have
C. has
D. should to have
解析：考察虚拟语气；本题中的动词remend后面的宾语从句要使用“should+动词原形”的虚拟语气，should可以省略。句意：谢磊，一个在国外学习的学生，强烈建议你要和一个寄宿家庭住在一起。本句在动词have前面省略了should。故B正确。