Shuāng / fāng / běn / lái / yǐ / jīng / tán / tuǒ / le / què / yǒu / rén / cóng / zhōng / zuò / gěng

双方本来已经谈妥了，却有人从中作梗。

The two sides had almost reached an agreement, but someone deliberately got in the way.