It’ s suggested by experts that teenagers ____at least 30 minutes exercising, five times a week.


  1. A.
    spend
  2. B.
    to spend
  3. C.
    spent
  4. D.
    have spent
A
試題分析：suggest后的從句用虛擬語氣，should+do,should可省略。指advise, suggest, propose, recommend，demand, require, request等后的賓語從句，從句謂語由“should+動(dòng)詞原形”構(gòu)成，其中的should在美國(guó)英語中通�？梢允÷�
考點(diǎn)：考查虛擬語氣的用法。
點(diǎn)評(píng)：本題難度適中。虛擬語氣是高考�？嫉膬�(nèi)容，需要考生熟記它們的各種情況，多記多練，還必須會(huì)分析理解句子的成分。
即學(xué)即練：It is strongly recommended that the machines____ every year.
A. check        B. should be checked       C. checked     D. shouldcheck
解析：B。句意：建議每年一定把機(jī)器檢修一次。
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