Dropping litter ______ never allowed in our city.


  1. A.
    don’t
  2. B.
    are
  3. C.
    will
  4. D.
    is
D
試題分析：句意：我們城市從來(lái)不許亂扔垃圾。結(jié)合語(yǔ)境可知本句描述的是客觀性動(dòng)作，故用一般現(xiàn)在時(shí)態(tài)，動(dòng)名詞做主語(yǔ)表示抽象含義，故謂語(yǔ)動(dòng)詞用單數(shù)，選D。
考點(diǎn)：時(shí)態(tài)及主謂一致
點(diǎn)評(píng)：英語(yǔ)中的時(shí)態(tài)主要是借助于時(shí)間狀語(yǔ)與上下文語(yǔ)境來(lái)進(jìn)行判斷。解答此類(lèi)題型，首先要注意句子中的時(shí)間狀語(yǔ)，如果沒(méi)有則要通過(guò)分析上下文，結(jié)合語(yǔ)境來(lái)判斷句子的時(shí)態(tài)。英語(yǔ)中的現(xiàn)在進(jìn)行時(shí)態(tài)和現(xiàn)在完成時(shí)態(tài)中的助動(dòng)詞，往往因?yàn)橹髡Z(yǔ)的不同，而有所不同，需要注意與主語(yǔ)保持一致。
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