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        1. She has a ruler, but she________ an eraser.
          A、doesn’t have                B、haven’t                 C、don’t have
          A

          試題分析:在一般現(xiàn)在時態(tài)中,當句子中有行為動詞時,應(yīng)該用結(jié)構(gòu):當句子的主語為非三單形式時,要借助于助動詞do,其結(jié)構(gòu)為:主語+don’t 動詞原形+其他;主語是三單時,其結(jié)構(gòu)是主語+doesn’t+動詞原形。當句子中沒有行為動詞時,要在be 動詞后面加not。根據(jù)選擇項的提示可知have是行為動詞,且主語是she故選A。
          點評 :學(xué)生要注意一般現(xiàn)在時句子中行為動詞的否定句的構(gòu)成,尤其特別是當主語為三單形式時謂語動詞的否定句結(jié)構(gòu),謂語動詞要用原形。
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