20. Herbal extracts/supplements are often metabolized in the liver, and some may have a direct impact ____ the metabolizing of prescribed medications.
(A) on
(B) in
(C) with
(D) at

答案：登入後查看
統計： A(69), B(11), C(4), D(3), E(0) #2344310

Apple Chen

B1 · 2025/06/12

#6476787

正解： (A) on 固定用法是 “have an impact on…”（對…有影響），句子中的 “have a direct impact ____ the metabolizing…” 最正確的介系詞是 on。