as a middle school student,i should focus more ___my studiesinonwithat要原因那!many of the teenagers in big cities____from ___suffering,suffer,suffered和 stress,stressed,stresses选填.要原因原因原因!1111

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as a middle school student,i should focus more ___my studiesinonwithat要原因那!many of the teenagers in big cities____from ___suffering,suffer,suffered和 stress,stressed,stresses选填.要原因原因原因!1111
as a middle school student,i should focus more ___my studies
in
on
with
at
要原因那!
many of the teenagers in big cities____from ___
suffering,suffer,suffered和 stress,stressed,stresses
选填.要原因原因原因!1111

as a middle school student,i should focus more ___my studiesinonwithat要原因那!many of the teenagers in big cities____from ___suffering,suffer,suffered和 stress,stressed,stresses选填.要原因原因原因!1111
1 填 on
focus on 集中(精力/意志/精神等)于,专注于
作为一名中学生,我应该更加专注我的学习.
2 选 suffer stress
第一个填动词原形,因为是复数,第二个填名词,压力的名词不可数
很多大城市的青少年都承受着压力