这题选什么?为什么?宾语从句主句用一般过去时,从句用过去时中的任意一种,是选D吗

这题选什么?为什么?宾语从句主句用一般过去时,从句用过去时中的任意一种,是选D吗--Could you please tell me ___the Bamboo Garden?-The day after tomorrow,I think.A.when will you visit B.when you will visit C.when would you visit D.when you would visit中学课本Unit 5 Could you please tell me where the restrooms are?这个句子前面could,后面却用are ,Could you tell me i can get to the mall?这个句子正确吗