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
詳解 (共 2 筆)
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(A) how well表示「效果如何」...
未解鎖
Many studies have l...
私人筆記 (共 1 筆)
未解鎖
Many studies have lo...
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