we should=–. nonrenewable natural resources for our future generation. A to protect B protect C protection D protecting

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1. B.
   Giải thích:các từ như should, must ,ought to,…+V

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2. we should………………… nonrenewable natural resources for our future generation.

   A to protect

   B protect

   C protection

   D protecting

   Chọn B vì sau should là verb bare

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