问题

Japan’s economy in the past twenty years. No one knows how long it before it regains its increase.
A:has been declining; will be
B:has declined; would be
C:had been in decline; would takeD.was on the decline; will take;
D:was on the decline; will take;
B:has declined; would be
C:had been in decline; would takeD.was on the decline; will take;
D:was on the decline; will take;
正确答案是: