大全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）
(E) that increasingly cold weather may have been
我选得是B.speculation后面只能接that引导的从句么?
B中的was what was太罗嗦了，直接说was就可以了。而且，原文的may是情态动词，一般需要保留。
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