学员疑问：老师，Our research results, published this month as a cover article in the Journal of Materials Chemistry B,（IF=7.0). 这句话哪里有错误吗？

老师解答：句子缺谓语动词，可以改为Our research results were published this month as a cover article in the Journal of Materials Chemistry B, which has an impact factor of 7.0.

点评分析：检查句子是否有误可以从结构和用词上着手。结构上，句子必须要有完整，主系表或者主谓宾结构，再检查名词单复数，谓语动词时态语态，以及主谓一致问题。此句中谓语published的语态有误，应该用被动语态。