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题目内容
（北京开放大学大学英语（2)）
"For" and "since" are often used with the present perfect. Fill in the blanks with "for" or "since".
1.
half an hour
2.
last year
3.
noon
4.
one month
5.
yesterday
6.
three days
7.
I started the job
8.
decades
1.
half an hour
2.
last year
3.
noon
4.
one month
5.
yesterday
6.
three days
7.
I started the job
8.
decades
参考答案