问题补充:
Americans spend more money than they have by using credit cards, so they are always .
A. in peace
B. in danger
C. in relief
D. in debt
答案:
A. in peace
B. in danger
C. in relief
(答案→)D. in debt
解析:介词短语辨析。A和平地;B处于危险中;C轻松地;D负债;句意:用信用卡美国人花的钱比他们挣的还要多,所以他们总是负债。