---- Is it high time that we _____ on the school building? ---- Yes, it _____.A.do some repairs; isB.do some repair; isC.did some repairs; isD.did some repair; was
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C解析在It is high time that…句型中，所跟的that引导的定语从句应该用虚拟语气，谓语动词应该用过去式，所以排除A、B选项。do some repairs和during repairs中常用repair的复数形式，但常说beyond repair, in good/bad repair, out of repair, under repair。