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He devoted most of his time to researching into space, believing his hard work would ______ sooner or later.
| A．pay back | B．pay for | C．pay off | D．pay up |
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He devoted most of his time to researching into space, believing his hard work would ______ sooner or later.
| A．pay back | B．pay for | C．pay off | D．pay up |
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