how
long
did
you
spend
on
your
homework
yesterday
?
=how
long
did
you
spend
(in
)
doing
your
homework?
=how
long
did
it
take
you
to
finish
your
homework
yesterday
?
注意：凡是用现在完成时翻译的，都是错误的，因为现在完成时不能与表示“过去”的时间状语连用。
祝你进步！
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