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
网友回答
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。