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杂草公主/yl
He is more careful than I。
ly的天空
had been 与过去时相反的虚拟语气.此处主句could have done （相对从句退一步）从句应该是对应的had been.
欢乐空间装饰
let sb do more carefuily
艾米Amysweety
want somebody to be more careful about something.
偶是杨洋
He is more careful than me.
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