English problem(wait on line)have u ever(fill in a word) any sports meetings(fill in a word)1990a.joined,sinceb.taken part in,sincec.joined,ford.taken part in,forPS:why?who can answer?
问题描述：
English problem(wait on line)
have u ever(fill in a word) any sports meetings(fill in a word)1990
a.joined,since
b.taken part in,since
c.joined,for
d.taken part in,for
PS:why?
who can answer?
答
B
since引导时间状语，表示现在完成时
take part in参加，后加meeting
答
b.
take part in参加活动
since自从.