题目

 The problem ______ many children, especially girls, have ________ school is getting more and more serious. A. which; got out of B. that, dropped out of C. that, fallen out of D. which, run out of 答案：B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项。drop out of school意为“辍学”，故选B。

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