1.since引导的时间状语,主句用完成时,故应该用have been
2.as(个人语感应该用as,)
3.A,这是一个do you think做主句的宾语从句结构,即原形该是Do you think what made him change his mind.通常把连词提到句首,do you think做插入语放句中,make后的宾语补足语用不带to的动词不定式,即make sb.do sth.
There ________ (be) great changes in our school since you le
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