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预备英语练习题They spend two hous on their work.(保持句子意思不变)They spen

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预备英语练习题
They spend two hous on their work.(保持句子意思不变)
They spend two hous ______ their work.
They spend two hours on their work.(保持句子意思不变)
They spend two hours ______ their work.
It______them two hours to do their work.
你打错了,
是hours,
2.in doing
3.took
语法
sb.spend time in doing sth.
sb.spend time on sth.
It takes sb.time to do sth.