7. Everyone participating in the early sociological study committed a crucial methodological error by failing to fully consider alternative ways of classifying their data.
(A) by failing to fully consider alternative ways of classifying their
(B) by failing fully to consider alternative ways of classifying their
(C) they failed to consider alternative ways to classify their
(D) by not fully considering alternative ways to classify the
(E) by not considering fully alternative ways of classifying his or her
答案是D，为什么A、B不对？
22. Bill Walton continued on playing, even though he had injuries that recurred over and over again, always hoping to return back to his position as a regular starter in the game he loved.
(A) on playing, even though he had injuries that recurred over and over again, always hoping to return back
(B) playing, in spite of recurrent injuries, always hoping to return
(C) playing, though injured over and over, and he was always hoping to return back
(D) on playing, even with injuries that recurred, and always hoped to return
(E) to play, despite recurring injuries, hoping that the return
答案是B，请问为什么，谢谢。
7.their没有指代
22:
A.continue on doing; recurred over and over again; return back
C.return back; and--but; he多余
D continue on doing
E continue on doing;that后没有句子
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