由于对手缺席比赛，他因对方弃权直接晋级。
He advanced to the next round by ___default when his opponent failed to show up.
他连续三个月没有还房贷，现在已经违约了。
He has ___defaulted on his mortgage payments for three consecutive months.
他因未参加期末考试而挂科了。
He failed the course due to ___defaulting on the final exam.
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