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manyhopeprimaryschoolsaresaid---insichuanprovinceinthelastfewyears.A.tobebuiltC.tohavebeenbuilt为什么是C不是A?

题目详情
many hope primary schools are said---in sichuan province in the last few years.
A.to be built
C.to have been built
为什么是C不是A?
▼优质解答
答案和解析
时间状语in the last few years表明:动作已经完成了,所以用C是不定式的完成形式.