--- My son, who is now studying at a university, uses more than 3,000 yuan a month.--- Well, tell him to be economical(节约). After all, _______.A.the morning sun never lasts a dayB.money doesn’t grow on treesC.light e, light goD.penny wise, pound foolish
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B解析考查谚语。A好事不长久。B天上不会掉馅饼。C来得快，去得快。D贪小便宜吃大亏。由语境可知B项符合句意。