A giant helium(氦) balloon is telling residents of Paris how good or bad the air quality is. When it’s good, the balloon ----measuring 22 meters wide and 32 meters high---shines green. ______, it’s red.


  1. A.
    Though terrible
  2. B.
    Whenever good
  3. C.
    If worse
  4. D.
    When bad
D
考查狀語從句的省略。根據(jù)句子，可知前后是對比相反情況，所以前面是When it’s good,，后面應(yīng)是When it is bad,it is 可以省略，所以選D。
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