OG中的一道语法题，大N指导一下 - ChaseDream

黄本P40 诊断测试第39题
According to scholars, the earliest writing was probably not a direct rendering of speech,
but was more likely to begin as a seperate and distinct symbolic system of communication ,
and only later merged with spoken language.

A was more likely to begin as

B more than likely began as

C more than likely beginning from

D it was more than likely begun from

E it was more likey that it began

the solution provided by OG is B

但是不理解，为什么。
而且more than likely 是什么意思， more likely 好像更顺一点，
OG说必须要有than ，不理解？？