Shakespeare spent his whole life__sonnets and plays.1.working at 2.working in 3.working out 4.working by

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• Shakespeare spent his whole life__sonnets and plays.1.working at 2.working in 3.working out 4.working by
• after having spent whole mornings on the river可以改成 After I have spent..吗原话为 After having spent whole mornings on the river,I always go home with an empty bag.可以改成After I have spent whole mornings on the river,I always go home with an empty bag.吗 如果主句是I went home 那After后还能用 动名词 after having spent吗 或者直接用after I had spent?
• the number of different prime factors of 48.和the number of different prime factors of 72