---Whatmakeshersoworried?---______atschool.A.Becausehersondoesn'twork

发布时间：2020-08-07 03:53:02

---What makes her so worried?---______ at school.A.Because her son doesn't work hardB.Because of her son's not working hardC.Her son doesn't work hardD.Her son's not working hard

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D解析动名词的复合结构作主语。A项和B项只能作原因状语，C项是主语从句，但缺少that。
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