Big schoolbags_ a large problem for student‘s for a long time .A.is B.are C.do D.does

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Big schoolbags_ a large problem for student‘s for a long time .A.is B.are C.do D.does
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Big schoolbags_ a large problem for student‘s for a long time .A.is B.are C.do D.does
Big schoolbags_ a large problem for student‘s for a long time .A.is B.are C.do D.does

Big schoolbags_ a large problem for student‘s for a long time .A.is B.are C.do D.does
这个题目有毛病 出的不好 小写的话 貌似还是复数are 但个人觉得填have been比较好
Big schoolbags首字母都大写的话 用单数is 个人觉得has been比较好
之所以建议用has/have 因为后面for a long time 是段时间 最好用完成时 这个题目出的有问题 建议你去问下你们的英语老师
Big schoolbags have been a large problem for student‘s for a long time .
译文:巨大的书包(意译为“繁重的作业负担”)对学生来说是一个长期存在的大问题.
参考:
Credit cards are a growing problem for Americans of all ages,especially for college-age individuals.
译文:信用卡(意译为“信用卡问题”)越来越成为美国各年龄层越来越严重的问题,尤其是大学生.

A.is

A,我认为big schoolbags只是说明一种现象,而不是专门之这种物体,不要被表面所迷惑