第1个回答 2011-07-09
时间段:一段时间。如2 days,1 month, 3 years, an hour等
时间点:具体的某个时间。10 o'clock, on wednesday, last year, yesterday等
表示时间段的组合:
since+时间点。如:I have been a student since last year.
for+时间段。如:I have been in the house for 7 days.
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