正确答案：
1.选D.and
解析：and 表示承接关系,特别是指经过一番努力或行动之后,自然就发生了的事情；而so 是具有较强的因果关系,一般是原因非常明显才有的结果；or 接的句子一般都是不好的,如
Work hard,or you will fail in the exam.
2.选A.and
解析：and 连接的分句,一般都是发生的好的事情,而or 一般接不好的事情,since 是由于的意思,表示原因,与本题不符,but表示转折,也不对.
有不明白的请继续追问,
Linda tried to become an excellent teacher,( ) at last she succeeded.A.so B.or C.but D.and
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
其他人气：219 ℃时间：2019-10-17 04:16:25
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