20. This is a secret between you and me. Please do not _________ it to other people.
(A) conceal
(B) instill
(C) guard
(D) reveal
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統計: A(35), B(20), C(21), D(302), E(0) #2562316
統計: A(35), B(20), C(21), D(302), E(0) #2562316