857. There is speculation that increasing cold weather was what may have been responsible for the Anasazi move from Mesa Verde to sites in other canyons.
(A) that increasing cold weather was what may have been
(B) whether increasing cold weather was what was
(C) that increasingly cold weather was what had been
(D) whether increasingly cold weather may have been what was
(E) that increasingly cold weather may have been
Answer is E, i think "increasing cold weather" is the subject here so can we use "have"(plural) for it. With subject phrase we should use singular verb.
(A) that increasing cold weather was what may have been
(B) whether increasing cold weather was what was
(C) that increasingly cold weather was what had been
(D) whether increasingly cold weather may have been what was
(E) that increasingly cold weather may have been
Answer is E, i think "increasing cold weather" is the subject here so can we use "have"(plural) for it. With subject phrase we should use singular verb.
