阿摩線上測驗
41. Many studies have looked at _____ echinacea works to prevent or shorten the course of a cold, but none were conclusive.
(A) how well
(B) what can
(C) what good
(D) of which
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統計： A(250), B(84), C(31), D(22), E(0) #3124535
統計： A(250), B(84), C(31), D(22), E(0) #3124535
詳解 (共 3 筆)
liang
#6016244
Many studies have looked at how well echinacea works to prevent or shorten the course of a cold, but none were conclusive.
許多研究已經探討了紫錐菊在預防或縮短感冒過程中的效果，但沒有一項是結論性的。
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