A:and most people didn’t know existed
B:that most people didn’t know it existed
C:most people didn’t know existed
D:that most people didn’t know existed
顺口溜,写出下面拼音对应的汉字,反复练读。
大海退潮见shā____滩,bèi ____壳留涌上岸,fēng____平浪静好出海,yú____船海上见。