When you read the book, you'd better make a mark ________ you have any questions．


  1. A.
    at which
  2. B.
    at where
  3. C.
    the place
  4. D.
    where
D
解析：
where引導(dǎo)地點(diǎn)狀語(yǔ)從句，相當(dāng)于at the place where引導(dǎo)的定語(yǔ)從句。
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  Microwaves may be great at warming up food, but what about warming people?

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