The bark of some species of oak trees yields substance used in ____ leather.


  1. A.
    treating
  2. B.
    to treat
  3. C.
    its treatment
  4. D.
    it treats
A
解析：
介詞后面只能跟動(dòng)詞的v+ing形式。不必十分清楚這句話的意思，便可選定A． treating。而因?yàn)槿鄙俳樵~of引導(dǎo)的短語of leather，故不能使用C． its treatment中的名詞treatment構(gòu)成詞組：in treatment of leather（最好說：in leather treatment）。
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B

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emergencies occur most frequently at night

it is more difficult to check your position

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avoid animal’s attacks

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