ocean water covers two-thirds of the earth .-----,ocean is larger than land .a that means b that is to say c in addition d however选哪个?一二的区别是

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oceanwatercoverstwo-thirdsoftheearth.-----,oceanislargerthanland.athatmeansbthatistosaycinadditiondh

ocean water covers two-thirds of the earth .-----,ocean is larger than land .a that means b that is to say c in addition d however选哪个?一二的区别是
ocean water covers two-thirds of the earth .-----,ocean is larger than land .
a that means b that is to say c in addition d however
选哪个?一二的区别是

ocean water covers two-thirds of the earth .-----,ocean is larger than land .a that means b that is to say c in addition d however选哪个?一二的区别是
应该选择:b that is to say 这就是说,可以作为插入语
that meas, 一般作为从句,不作为插入语

b
a不需要加逗号

B 第一个后面不能有逗号,that means ocean is....
第二个是是插入语,不影响句子的整体性。