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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
考查短语辨析,pay back偿还,pay for为了什么付款,pay off还清,得到回报,pay up 付清,句意:他把他的大部分时间献身于研究太空,相信他的努力工作迟早会得到回报的。故选C。
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