I will do it.A. after a minuteB. in a minuteC. right wayD. before a minute

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A. after a minute
(答案→)B. in a minute
C. right way
D. before a minute
解析：after a minute无此说法；in a minute 一分钟后；right way立即，马上； before a minute无此说法。前文为将来时态，可知选B。我一分钟后做。