since（既然）语气较弱,强调已知的事实
for是并列连词,表示推断的原因,或对前一分句补充说明理由.
_you are free today,I hope you can help me with my maths.
_you are free today,I hope you can help me with my maths.
1Since
2For
答案是1我选2 为什么?
p62
1Since
2For
答案是1我选2 为什么?
p62
英语人气：947 ℃时间：2019-10-10 06:42:08
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