-What are you going to do this Sunday?
-I ________ yet.

A．won't decideB．didn't decideC．haven't decidedD．don't decide

C

解析試題分析：現(xiàn)在完成時(shí)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.
考點(diǎn)：現(xiàn)在完成時(shí)的基本構(gòu)成和用法.
點(diǎn)評： 注意現(xiàn)在完成時(shí)和一般過去時(shí)兩種時(shí)態(tài)的區(qū)分
(1)一般過去時(shí)的謂語動詞用過去式，而現(xiàn)在完成時(shí)的謂語基本構(gòu)成是"助動詞have /has +過去分詞"。 (2)一般過去時(shí)通常與表示過去的時(shí)間狀語連用。如：yesterday, last week, two years ago, just now, in 2002等； 而現(xiàn)在完成時(shí)則常與just, already, ever, never等副詞和these days, this week, since..., for...等表示一段時(shí)間的狀語連用。

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