In experiments ________ young teens are allowed to sleep as long as they want, they tend to sleep an average of 9 hours.


  1. A.
    that
  2. B.
    what
  3. C.
    which
  4. D.
    where
D
句意：在允許青少年想睡多久就睡多久的試驗中，他們的（自然）睡眠時間往往是平均9個小時。本題考查定語從句，先行詞為experiments，在定語從句中作狀語，因此要用關(guān)系副詞where。
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