The middle-aged man said he would accept the job, so we have asked him to his acceptance

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(答案→)A. confirm
B. convey
C. convince
D. consider
解析：动词Confirm确认，证实；convey传达，表达；convince使…相信…；consider考虑…；句义：这位中年男人说他会接受这份工作，于是我们要求他通过写的方式确认他接受这个工作。根据句义说明conform表示确认符合上下文的含义。故A正确。