摘要： Why
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Why does science-fiction（科幻小说）always ________Martians as having green skin?
- A.describe
- B.show
- C.introduce
- D.produce
why ________ we eat out when we can easily cook ourselves at home?
- A.must
- B.shall
- C.can
- D.may
Why do you want a new job ________ you have got such a good one?
- A.that
- B.where
- C.which
- D.when