Bad habits, ______ formed(形成), are difficult to give up.


  1. A.
    and
  2. B.
    once
  3. C.
    for
  4. D.
    but
B
試題分析：考查狀語(yǔ)從句的省略式，英語(yǔ)中如果主從句的主語(yǔ)一致，可以省略從句的主語(yǔ)和be動(dòng)詞，once formed＝once bad habits are formed句意：壞習(xí)慣，一旦形成，就很難戒掉。選B。
考點(diǎn)：考查從句的省略式
點(diǎn)評(píng)：做這種題目可以用還原法做題，先把主語(yǔ)和be動(dòng)詞加上，再判斷是主動(dòng)還是被動(dòng)。句意通順才行。
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B．the study observed people as well as tested specific changes．

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B．People aged 45 to 70 have bad habits in the United Kingdom．

C．Governments should take measures to help people change their bad habits．

D．People have adopted the four healthy habits after knowing they're good．

4.

 

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