solve
原因如下：分析句子成分,句子中有两个动词solve和require,通过分析后,solve是谓语,required many hours来充当定语从句,另,从foten可知时态用一般现在时,主语children是复数,因此用动词原形.
Children often _____solution to the problem required many hours.(solve)
Children often _____solution to the problem required many hours.(solve)
英语人气：605 ℃时间：2020-05-17 06:03:52
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