A. When a quasi-stationary front passes through, because the cold and warm air masses are evenly matched, the front moves slowly, so the precipitation takes a long time, so it does not meet the meaning of the question;
B. When a quasi-stationary front passes through, there are many It is continuous precipitation with low precipitation intensity, so it does not meet the meaning of the question;
C. Because the quasi-stationary front moves slowly, it often wanders back and forth in a certain area, so its scope of influence is large, so it does not meet the question. Meaning;
D. Quasi-stationary fronts often form continuous precipitation when passing through, so it is correct.
So choose: D