Choose the correct verb form to complete the following sentence.
Both light and heat _________ causes of the sofa's fading color.
(1 point)
Responses
was
was
were
were
is
is
isn't
isn't
Both light and heat _________ causes of the sofa's fading color.
(1 point)
Responses
was
was
were
were
is
is
isn't
isn't