Question

spent .......on........等于什么。前面是half an hour 然后它要保持原意。

Answer 1

sb spends Time/Money on sth
=sb spends Time/Money (in) doing sth
=It takes sb Time/Money to do sth

I spent half an hour on this book.
=I spent half an hour (in)reading this book.
=It took me half an hour to read this book.

Answer 2

请完整地写出原题。