Tom ________ all his loan after twenty years during ________ his family lived a hard life.A.paid back; whenB.paid off; whyC.paid off; whichD.paid for; that
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C解析本题考查pay的有关短语的意义区别和介词+关系代词引导的定语从句。pay back偿还；pay off还清；pay for支付；关系代词位于介词之后，只能用which，指代先行词twenty years，故正确