When you have a singular subject in a sentence and a clause in parentheses - which, if the parentheses didn't exist, would mean a plural verb was required -what is the correct form of verb?
For example, what is the correct verb in (b) below:
(a) The cat, and for that matter the dog, were vicious.
(b) The cat (and for that matter the dog) was/were vicious.
I'd be inclined to use 'was' in both cases.
"The editor, as well as the reviewers, believes that the article..."