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NASA's Mars detectot,Opportunity,succeeded in finding signs that water once existed on the planet.It is now believed that the planet ________ life.


  1. A.
    should once support
  2. B.
    should once have supported
  3. C.
    could once support
  4. D.
    could once have supported
B
解析:
考查情態動詞的用法,根據前句信息,那個星球上曾經有水存在的跡象已經被成功找到了,后句的語氣應該很肯定的,談論的是過去的事情,選的情態動詞后要出現完成形式,所以在B和D里選,根據語氣判斷是比較肯定的,所以選擇B,意思是,現在人們相信那星球上應該是存在過生命的。
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