17. Contestants in many sports prepare for competition by eating pasta as part of a "carbohydrate-loading " regimen that is supposed to provide quick energy.
(A) prepare for competition by eati ng pasta as
(B) prepare for competition and eat pasta, which is
(C) prepare for competition by eating pasta because this is
(D) eat pasta to prepare for competing, which is
(E) eat pasta to prepare for competing as
答案选A
请问大家为什么不选E呢
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