作业帮Many books on science ______ since I went to college .A.were bought B.have been bought 应选A还是BMany books on science ______ since I went to college .A.were bought B.have been bought C have bought D bought 应选哪个?若选B,则bought是非延
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Many books on science ______ since I went to college .A.were bought B.have been bought 应选A还是BMany books on science ______ since I went to college .A.were bought B.have been bought C have bought D bought 应选哪个?若选B,则bought是非延
Many books on science ______ since I went to college .A.were bought B.have been bought 应选A还是B
Many books on science ______ since I went to college .A.were bought B.have been bought C have bought D bought 应选哪个?
若选B,则bought是非延续性动词怎么能与完成时连用,
Many books on science ______ since I went to college .A.were bought B.have been bought 应选A还是BMany books on science ______ since I went to college .A.were bought B.have been bought C have bought D bought 应选哪个?若选B,则bought是非延
选B
根据since,确定用现在完成时；且书是被买,故用被动语态.
望采纳~
B
B
这是过去完成时
书是物，所以被买，用be bought被动
因为发生在过去
所以have been bought而且这不是过去完成时，过去完成时的结构是had ＋过去分词 过去完成时的被动结构是had＋been＋过去分词说错了。。。不是过完，是现在完成时 主动have/has+done 被动have/has+been done...
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这是过去完成时
书是物，所以被买，用be bought被动
因为发生在过去
所以have been bought
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这里是 被买，不是have bought......
不知道这么说清楚不？