【正确答案】 A

【答案解析】[解析] 划线词为动词，意思是“限制”，与A项limited(限制)为同义词，又如：The teacher limited his students to 500 words for their compositions．老师把学生的作文限制在五百字以内。B项意为“允许”，例：Their teacher allowed them three days for the assignment．老师给他们三天时间完成作业。C项意为“阻止”，例：The policemen stopped the fight．警察制止了这场斗殴。D项意为“保持”，例：I kept it all the time to remind me of you．我一直保存着它，使自己想着你。