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since and for

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用since或for填空 1.We have learned five lessons ?????the beginning of this term. 2.Mrs Liao has been in hospital?????last week . 3.I have stayed at my aunt's?????two weeks.
since and for
解题思路: 如下
解题过程:
用since或for填空
1.We have learned five lessons since the beginning of this term.
2.Mrs Liao has been in hospital since last week .
3.I have stayed at my aunt's for two weeks.
“since +点时间 ” :since 1996 自从1996 年
since six years ago 自从六年前
“ for +段时间 ” :I have been a teacher for three years .
最终答案:略