问题描述：
Linda tried to become an excellent teacher,( ) at last she succeeded.A.so B.or C.but D.and
Help others whenever you can ( ) you will make the world a nicer and place to live.
A.and B.or C.since D.but
急,说明理由
Help others whenever you can ( ) you will make the world a nicer and place to live.
A.and B.or C.since D.but
急,说明理由
问题解答：
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