when i was a child,we ___wear a uniform for school.空着的地方为什么不选must而是had to

~ must和have
to两者都表示必须，但must
侧重于说话者的主观看法，认为有必要或有义务去做某事；have
to
则重于客观需要，含有不得不或被迫之意.
因为是孩子,学校强迫统一着装上学.所以这里要have
to的过去式had
to.

must与have
to都有表示“必须”，二者的区别是：must强调的是主观原因必须做什么，have
to
强调的是客观原因必须做什么。如：I
have
to
get
up
early
to
attend
a
meeting.
(早起的原因是必须参加一个会议，这个人本身可能愿意早起，也可能不愿意早起。)
I
must
go
now.(我走是我自己想走，并没有其它原因要求我必须这样做。)
回答问题本身，上学穿校服，学生可能愿意穿也可能不愿意穿，但是这个规矩是学校要求的，学生必须遵守。

had
to
表示”不得不“的意思，很明显，我们在小时候不喜欢穿校服但是又不得已而为之,表达自己的情感，而must
情感是必须的意思，不能更好表达情感。

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