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        1. Mike often exercises      half an hour in the morning.
          A.atB.ofC.withD.for
          D

          試題分析:at在時間空間的一點;of關于,……的;with伴隨,用某種工具;for為了,對于。句意:麥克經(jīng)常在上午鍛煉半個小時。For后面常接一段時間,表示動作持續(xù)的時間長短,故選D。
          點評:英語介詞的一個特點是一詞多義,并且介詞間語義交叉現(xiàn)象很多,習慣用法也很多,有時很難從詞義上區(qū)分開來。故學習中要注意不斷總結,熟記一些介詞和動詞的固定搭配用法及習慣用法,是完成此類問題的捷徑。
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