Do you think A they B will C except our plan D without an argument? E No error.

Explanation: The sentence contains a wrong word choice in the verb segment.

The word 'except' is incorrect in this context. The intended verb is 'accept', which means to agree to something. 'Except' means 'other than' and does not convey the intended meaning here. Replace 'except' with 'accept'.

Corrected sentence: "Do you think they will accept our plan without an argument?"

• 'they' is correct as the subject pronoun referring to the people involved.

• 'will' is correct as the auxiliary verb forming the future tense with 'accept'.

• 'without' is correct as a preposition meaning 'in the absence of', which fits 'without an argument'.