British teenagers can leave school at sixteen after taking their GCSE exams.They study for esamsin as many as ten subjects,__ they have to work pretty hard!Today's teens speed more time doing their homework than any teenagers in the past,studying for

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British teenagers can leave school at sixteen after taking their GCSE exams.They study for esamsin as many as ten subjects,__ they have to work pretty hard!Today's teens speed more time doing their homework than any teenagers in the past,studying for

British teenagers can leave school at sixteen after taking their GCSE exams.They study for esamsin as many as ten subjects,__ they have to work pretty hard!Today's teens speed more time doing their homework than any teenagers in the past,studying for
British teenagers can leave school at sixteen after taking their GCSE exams.They study for esams
in as many as ten subjects,__ they have to work pretty hard!Today's teens speed more time doing their homework than any teenagers in the past,studying for 2.5-3 hours every evening.A but B or C so D because

British teenagers can leave school at sixteen after taking their GCSE exams.They study for esamsin as many as ten subjects,__ they have to work pretty hard!Today's teens speed more time doing their homework than any teenagers in the past,studying for
选C啊.前面说他们学习十种科目后面说他们要非常努力的学习.中间填所以
选C