Spend much time ▁▁▁▁▁doing my homework .用in 还是on

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Spendmuchtime▁▁▁▁▁doingmyhomework.用in还是onSpendmuchtime▁▁▁▁▁doingmyhomework.用in还是onSpendmuchtime▁▁▁▁▁

Spend much time ▁▁▁▁▁doing my homework .用in 还是on
Spend much time ▁▁▁▁▁doing my homework .
用in 还是on

Spend much time ▁▁▁▁▁doing my homework .用in 还是on
in
spend sth on sth
spend sth in doing sth (in可省略)

IN

in

in

in 也可以不填