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So effective are inhaled steroids at staving off asthma attacks that doctors now regard them as _______ therapy.
- A.a mainstay of
- B.a precursor to
- C.a supplement to
- D.a complement to
- E.a foundation of
- F.an antithesis to
A,E显示答案
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以上解析由 考满分老师提供。
