问题描述：
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
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
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