问题描述：
一道SAT IS语法题
(a squadron of newly trained,enthusiastic firefighters from training academies,each year they graduate )to begin work in the nation's cities.
为什么原句不行?要改成 Each year a squadron of newly trained,enthusiastic firefighters graduates from training academies.
a squadron of newly trained,enthusiastic firefighters 谓语为何是单数?
a group of students 难道谓语也是单数吗?
(a squadron of newly trained,enthusiastic firefighters from training academies,each year they graduate )to begin work in the nation's cities.
为什么原句不行?要改成 Each year a squadron of newly trained,enthusiastic firefighters graduates from training academies.
a squadron of newly trained,enthusiastic firefighters 谓语为何是单数?
a group of students 难道谓语也是单数吗?
问题解答：
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