问题描述：
高中英语语法题,
A study in Britain__on under 25s showed that special writing classes were necessary at school.
A.carried out B.being carried out C.don't they D,having been carried out
A study in Britain__on under 25s showed that special writing classes were necessary at school.
A.carried out B.being carried out C.don't they D,having been carried out
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