虚拟语气在suggest, demand, propose, command, request, desire, order, insist等动词之后的宾语从句中,表示命令和建议: suggest/ demand/ propose/ command/ request/ desire/ order/ insist/ask(请求,要求)+(that) + sb.+(should ) +动词原形 ,should 可以省略,如: ①We suggest that the meeting (should) be postponed. 我们建议会议延期.
所以这里选A ,省略了should