1."Suzie hasn't written to us for such a long time."
"What do you suppose_____to her?"
选D.happened
因为do you suppose是插入语,所以
原句可以看成是"What (do you suppose你认为) happened to her?"
2.George is putting on weight,and he_____quite fat.
选B.is being
因为乔治在增肥,所以体重正在增长.
其他的will,be going to都是有主观意愿的词；而变胖不是主观意愿.