单选题The problem ______ many&n

问题补充：

单选题Theproblem______manychildren,especiallygirls,have______schoolisgettingmoreandmoreserious.A.which;got out ofB.that;dropped out ofC.that;fallen out ofD.which;run out of

答案：

B解析第一空需要引导同位语从句的词，而which不可引导同位语从句。故排除A、D两项。drop out of school意为“辍学”，故选B项。