填It is
It为形式宾语,代替后面的to work in a school,防止"头重脚轻".
To work in a school is very instersting .改为同一句__ __ very instersting to work in a school
To work in a school is very instersting .改为同一句__ __ very instersting to work in a school
英语人气：359 ℃时间：2020-03-29 16:48:47
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