A. carry out B. can carry out

C. carries out D. has carried out

【答案】A

【解析】

试题分析：考查虚拟语气。句意：建议李先生继续他的计划。It is suggested that ... 结构中,that 引导的从句的谓语动词要用虚拟语气.request, demand, order, decide ...等动词都有这种用法。故选A项。