18．My aunt often drops by my house ______ Sunday afternoons because I am free then．（　�。�
A．atB．inC．onD．of

分析 我的姑姑經(jīng)常在星期天的下午來(lái)我家，因?yàn)槟菚r(shí)我有空．

解答 答案：C．
根據(jù)設(shè)空處后面的時(shí)間"Sunday afternoons"可知句子中的時(shí)間狀語(yǔ)是具體到某一天的下午，所以用介詞on．a(chǎn)t+時(shí)間點(diǎn)；in+年、月、季節(jié)等； on+具體的某一天或某一天的早中晚．of表…的．故選C．

點(diǎn)評(píng) 英語(yǔ)介詞的一個(gè)特點(diǎn)是一詞多義，并且介詞間語(yǔ)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(kāi)來(lái)．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(lèi)問(wèn)題的捷徑．

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