why did you ___so much time ____ history book?Why did you ____(spend)so much time ____(read) history book

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why did you ___so much time ____ history book?Why did you ____(spend)so much time ____(read) history book

why did you ___so much time ____ history book?Why did you ____(spend)so much time ____(read) history book
why did you ___so much time ____ history book?
Why did you ____(spend)so much time ____(read) history book

why did you ___so much time ____ history book?Why did you ____(spend)so much time ____(read) history book
第一空spend 因为前面有did,后面动词无需再用一般过去式;
第二空reading 此为spend sth on doing sth句式(花费某物做某事).其中on可省略.

why did you __spend_so much time __reading__ history book?

spend reading.
spend 与前面的did构成过去时态,spend ...doing是词组用法了啦