Have you considered the students’ request ______ the school library ______ more books on popular science?A.that; provideB.when ; providedC.which; should provideD.where; would provide
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A解析考查同位语从句和虚拟语气，第一空填that引导同位语从句，that不做成分，指起到连接作用，对request进行说明，第二空填provide，省略了should，因为同位词是request，同位语从句用虚拟语气，Sb （should）do.选A。