Mortgage______had risen in the last year because the number of low-income families was on the increase.

【正确答案】 C

【答案解析】解析：句意：去年拖欠抵押贷款的现象不断增多，因为低收入家庭的数量在上升。default欠缺。defect缺点。deficit赤字。deception欺骗。