——_________ should your robot need_________ batteries?

——Every two months.


  1. A.
    How soon, to be changed
  2. B.
    How long, to change
  3. C.
    How much, change
  4. D.
    How often, to change
D
考查特殊疑問句的回答。根據(jù)答語 Every two months可排除A 和B ,且句中的need是實義動詞need to do sth.故選D。
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【小題1】The medicine given by doctors_______.
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