28．Help others whenever you can______ you will make the world a nicer place to live in.(A)and(B)or(C

問題詳情

28．Help others whenever you can______ you will make the world a nicer place to live in.
(A)and
(B)or
(C)unless
(D)but

答案：A
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)