Since you are always working hard at your lessons, your efforts will .
A. pay off
B. pay for
C. pay back
D. pay out
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(答案→)A. pay off
B. pay for
C. pay back
D. pay out
解析：A 考察动词短语辨析。Pay off还清，得到回报；pay for支付；pay back偿还；pay out付出。句义：既然你总说非常勤奋，你的努力总会得到回报的。