问题
选择题
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
答案：A
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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