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
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
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。