He devoted most of his time to researching into space, believing his hard work would ______ sooner or later.


  1. A.
    pay back
  2. B.
    pay for
  3. C.
    pay off
  4. D.
    pay up
C
考查短語辨析，pay back償還，pay for為了什么付款，pay off還清，得到回報，pay up 付清，句意：他把他的大部分時間獻身于研究太空，相信他的努力工作遲早會得到回報的。故選C。
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B．Because he had to guard the treasure cave.
C．Because he wanted to find the treasure cave.
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【小題2】What did the man find when he showed his cave to the old man?
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