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        1. -What are you going to do this Sunday?
          -I ________ yet.
          A.won't decideB.didn't decideC.haven't decidedD.don't decide
          C

          試題分析:現(xiàn)在完成時用來表示之前已發(fā)生或完成的動作或狀態(tài),其結(jié)果的確和現(xiàn)在有聯(lián)系。動作或狀態(tài)發(fā)生在過去 但它的影響現(xiàn)在還存在;也可表示持續(xù)到現(xiàn)在的動作或 狀態(tài)。其構(gòu)成: have (has) +過去分詞。根據(jù)語境可知此句的含義是我還沒決定,因主語是I,故用助動詞have not+過去分詞,故選C.
          點(diǎn)評: 注意現(xiàn)在完成時和一般過去時兩種時態(tài)的區(qū)分
          (1)一般過去時的謂語動詞用過去式,而現(xiàn)在完成時的謂語基本構(gòu)成是"助動詞have /has +過去分詞"。 (2)一般過去時通常與表示過去的時間狀語連用。如:yesterday, last week, two years ago, just now, in 2002等; 而現(xiàn)在完成時則常與just, already, ever, never等副詞和these days, this week, since..., for...等表示一段時間的狀語連用。
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