北开北京开放大学大学英语（2）4.3 小测试最新答案

题目1
正确
获得6.00分中的6.00分
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题干
“For” and “since” are often used with the present perfect. Fill in the blanks with “for” or “since”.
1.
for
half an hour
2.
since
last year
3.
since
noon
4.
for
one month
5.
since
yesterday
6.
for
three days
7.
since
I started the job
8.
for
decades