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.
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.