这道题是选D.
1、句子成分划分:
①【After circling around the earth for three days状语】,【Shenzhou Spaceship 主语】【received谓语 】【the command from the ground that( )as scheduled the next day.宾语】
②【the command 】from the ground 【that( )as scheduled the next day同位语从句】
2、考点:英语中表示“要求、建议、命令、请求”等的动词,后面接宾语从句时,从句用【should+动词原形】结构的【虚拟语气】,should 可以省略;
同时,这类【动词所对应的名词】,后面接【表语从句、同位语从句】,也应该用同样的动词形式.
【the command】that【it (should) land】.
因此,答案D.