問1題語法

penghu86274147

No one knows exactly ...

a)  how did speech begin
b) how speech began

there are four choices but i think the third and fourth answers can be eliminated.

the answer is B. What's the difference between the two choices?

penghu86274147

i guess you mean 在句首能倒ｂｕｔ在句尾不能倒, right?