Mike often exercises      half an hour in the morning.
A.a(chǎn)tB.ofC.withD.for
D

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