问题
选择题
He devoted most of his time to his research, believing his hard work would___sooner or later.
A．put off
B．take off
C．come off
D．pay off
答案
答案：D
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He devoted most of his time to his research, believing his hard work would___sooner or later.
A．put off
B．take off
C．come off
D．pay off
答案：D