He usually spends much time___his lesson.a.doing b.to do c.does d.did

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He usually spends much time___his lesson.a.doing b.to do c.does d.did
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He usually spends much time___his lesson.a.doing b.to do c.does d.did
He usually spends much time___his lesson.a.doing b.to do c.does d.did

He usually spends much time___his lesson.a.doing b.to do c.does d.did
a.doing

spend much time (on)doing sth.
花很多时间做某事,on 可加可不加