答案：A new school was built by them last year．考查被动语态．被动语态主语用a new school，是动作build修建的承受者，由last year去年，可知，用一般过去时态的被动语态，结构是was/were+动词的过去分词．主语是单数，因此用was．build的过去分词是built．by介词，这里的"被"的意思，后跟they的宾格them．last year去年，时间状语．答案是A new school was built by them last year．
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