"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

正确答案是： "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