英语：同义句转换
问题描述：
英语：同义句转换
We haven't met for a long time
___ ___ ___ ___since we met last time.
If we beat them in the match,we will be the best.
if we ___ ___ ___,we will be the___.
You should return the book to the library on time.
You should___the book___ ___ the library on time.
答
It has been long
win the match; winner
give ; back to