If you don't work hard,you'll fall behind.(改为同义句 —— ——,——you'll fall behind.
问题描述：
If you don't work hard,you'll fall behind.(改为同义句 —— ——,——you'll fall behind.
答
work hard ，otherwise
答
work hard;or.
答
Work hard，unless
答
Work hard or
答
应该是：Work hard,or you'll fall behind.意思是：努力学习,否则你就会掉队的.
答
—Work— —hard—，—or else—you'll fall behind。
or else 否则