选A.原句是Itisimportantthatweshouldgetthismessageacrosstovoters.这里是虚拟语气的一个用法之一.只不过should可以省略的.
这里是虚拟语气的一些特例。表情绪.观点的形容词或名词也要用虚拟语气.如:necessary、important、impossible、natural、strange、surprising、funny、right、wrong、better、apity,theshame,nowonder等。句型:Itis.......that+主语从句,从句的谓语动词都要用should+原型或只用动词原型。eg:Doyouthinkitisnecessarythathe(should)notbesenttoLingbao.Itisstrangethatsuchapersonshouldbeourfriend. 一想要(desire)一宁愿(prefer)一坚持(insist)二命令(order,command)三建议(advise,suggest,propose/recommend)四要求(demand,require,request,ask)中,无论主句谓语动词为何种时态,从句的谓语动词都用:"should+do"。should可以省略。eg:Hesuggestedthatwe(should)taketheteacher'sadvice.Heinsistedthatwe(should)taketheteacher'sadvice.Hedemandthatwe(should)taketheteacher'sadvice.Heorderedthatwe(should)taketheteacher'sadvice.虚拟语气还可用在定语从句中,表示:“早该做某事了”时,定语从句中的谓语动词须用虚拟语气,其虚拟语气的结构为:Itis(high/about)timethat+主语+动词的过去式/should+do(优先使用动词过去式),即从句用虚拟过去式。