题目内容：

The twin___________work hard at lessons.We must help them.A / B don't C aren't D is like
选择

优质解答

　　选B.
　　句中已经有谓语动词work了,故CD错误,只能选助动词don't.
　　意思是：这对双胞胎不在功课上下功夫,我们必须帮助他们.
　　请采纳!