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