英语中的时间点和时间段是什么意思 什么叫时间段和时间点?
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since+\u65f6\u95f4\u70b9.\u5982\uff1aI have been a student since last year.
for+\u65f6\u95f4\u6bb5.\u5982\uff1aI have been in the house for 7 days.
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