In the past ten years, the number of Americans using 90 percent of their disposable income to pay off credit card debts ______ by 30 percent.
빈칸 정답이 has risen 인데 왜 has been rising 은 안될까요??
지금까지 증가해오고 있다. 이렇게 해석도 되지않나요??
In the past ten years, the number of Americans using 90 percent of their disposable income to pay off credit card debts ______ by 30 percent.
빈칸 정답이 has risen 인데 왜 has been rising 은 안될까요??
지금까지 증가해오고 있다. 이렇게 해석도 되지않나요??


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