单选题
The voluntary decision to label seems to have been
rewarded
.
A、
paid out
B、
paid back
C、
paid up
D、
paid off
【正确答案】
D
【答案解析】
pay out：付出(款项等)；pay back：偿还(借款)；pay up：还清；pay off：赢利，得到好的结果，取得成功。题中reward意为“赢利，有利益的”，故可知D项最符合题意。
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