i have been there (for) three times.这句话中括号中的for一定要加吗?

问题描述:

i have been there (for) three times.这句话中括号中的for一定要加吗?

不用加

应该是的

i have been there (for) three times.=since three times ago.
for+一段时间 这词问现在完成的标志词.