问题标题：
it'sn_____forenglishlearnerstoknowmoreaboutthehistoryofbritain
问题描述：
it'sn_____forenglishlearnerstoknowmoreaboutthehistoryofbritain
孟凡茂回答：
It's(necessary)forenglishlearnerstoknowmoreaboutthehistoryofbritain.
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