---______have the scientists been there？

---For about two years．


  1. A.
    How many times
  2. B.
    How
  3. C.
    What time
  4. D.
    How long
D
分析：答句改為完整句的話就是The scientists have been there for about two years．由于是副詞there，所以介詞被省略了，還原的話應(yīng)該是have been in(一直在某地)，for about two years就表示have been there的時(shí)間長(zhǎng)度。該用how long．(延伸)“for+時(shí)間長(zhǎng)度”在句子中擔(dān)任狀語，表示動(dòng)作或狀態(tài)的持續(xù)時(shí)間長(zhǎng)度，用how long來提問。在It takes+時(shí)間，spend+時(shí)間的句型里，時(shí)間是句子中的賓語，提問時(shí)也用how long，如：It took him two hours to do the work．How long did it take him to do the work？
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